Lena Diaz Books in Order (Updated June 12, 2026)

Lena Diaz writes romantic suspense, mystery, police-procedural romance, and thriller-leaning Harlequin Intrigue novels. Her books are mostly arranged by series, not by one shared universe.

Lena Diaz Books in Order (Updated June 12, 2026)

Order matters most inside each named series. The romances often resolve book by book, but teams, settings, family ties, and agency structures carry enough weight that publication order is still the clearest route.

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The best starting point depends on what kind of suspense you want. Choose He Kills Me, He Kills Me Not for darker serial-killer romantic suspense, Exit Strategy for rogue-operative thrillers, Murder on Prescott Mountain for cold-case investigations, or Hunting the Crossbow Killer for her newest ongoing mystery series.

Reading Order at a Glance

  • Best first book overall: He Kills Me, He Kills Me Not
  • Best newer starting point: Hunting the Crossbow Killer
  • Best Harlequin Intrigue procedural route: Murder on Prescott Mountain
  • Best action-thriller route: Exit Strategy
  • Most important order note: Read Tennessee Takedown as a Tennessee SWAT prequel, then continue with Mountain Witness.

Deadly Games Books in Order

The Deadly Games series is sometimes associated with nursery-rhyme-style titles and serial-killer suspense. Read this series in order because recurring danger, family links, and the final EXIT Inc. bridge make the sequence clearer.

  1. He Kills Me, He Kills Me Not (2011): Amanda Stockton, the only survivor of a killer’s earlier game, is pulled back into danger when a new victim suggests the nightmare is not over.
  2. Simon Says Die (2012): Madison McKinley believes she is being stalked while the police chase the “Simon Says” killer, pushing the series deeper into psychological threat and suspicion.
  3. Ashes, Ashes, They All Fall Dead (2013): FBI Special Agent Tessa James investigates taunting letters tied to murder and fire, while forgotten pieces of her own past become part of the danger.
  4. Take the Key and Lock Her Up (2014): Detective Emily O’Malley finds a killer’s lair and crosses paths with Devlin Buchanan, making this both a Deadly Games finale and a bridge toward EXIT Inc.

Morgan Brothers Books in Order

The Morgan Brothers books are a short Harlequin Intrigue romantic suspense pair. They can be read quickly, but publication order keeps the family connection clean.

  1. Explosive Attraction (2013): Detective and bomb technician Rafe Morgan protects psychologist Darby Steele after a killer uses her as part of a timed murder game.
  2. Undercover Twin (2013): DEA agent Nick Morgan joins Heather Bannon on a dangerous undercover rescue after Heather’s twin is abducted.

Tennessee SWAT Books in Order

Lena Diaz’s site identifies Tennessee Takedown as a prequel. Read it first if you want the full Tennessee SWAT setup, then move into the numbered books.

  1. Tennessee Takedown (2014): A small-town SWAT officer protects Ashley Parrish after several attempts on her life expose a framing plot and a larger threat.
  2. Mountain Witness (2017): Detective Chris Downing saves reclusive Julie Webb from an attacker, opening the official Tennessee SWAT sequence with danger in Destiny, Tennessee.
  3. Secret Stalker (2017): SWAT officer Max Remington must protect Bexley Kane, the woman who once left his life under a cloud of suspicion.
  4. Stranded with the Detective (2018): SWAT officer Colby Vale and rancher Piper Caraway are left to survive in remote mountain terrain after a routine investigation turns deadly.
  5. SWAT Standoff (2018): Blake Sullivan and Donna Waters must put their differences aside when the rest of their SWAT team disappears.

EXIT Inc. Books in Order

EXIT Inc. is more thriller-driven than some of Diaz’s Harlequin Intrigue work. Read these three books in order because the organization itself is the continuing threat.

  1. Exit Strategy (2015): Mason Hunt goes rogue after learning his target, Sabrina Hightower, may be innocent and that EXIT Inc. may be hiding darker operations.
  2. No Exit (2016): Jace Atwell tries to infiltrate EXIT Inc. by getting close to Melissa Cardenas, only to find that she is also searching for the truth.
  3. Final Exit (2017): Special Agent Kade Quinn targets the remaining EXIT operatives, but assassin Bailey Stark forces him to question the mission he has been given.

Marshland Justice Books in Order

Marshland Justice is set around the Florida Everglades and Mystic Glades. The cases stand on their own, but the setting works best in sequence.

  1. Missing in the Glades (2015): Detective Jake Young searches for a missing person in the Everglades and finds Faye Star, whose own secrets complicate the case.
  2. Arresting Developments (2015): Ex-Navy pilot Dex Lassiter survives a crash in the swamp and becomes involved with Amber Callahan, who is being hunted by dangerous men.
  3. Deep Cover Detective (2016): Detective Colton Graham watches a suspicious bed-and-breakfast owner while trying to bring down a robbery kingpin.
  4. Hostage Negotiation (2016): Police chief Zack Scott helps Kaylee Brighton after she escapes captivity, turning the case toward the women still missing in the swamp.

The Mighty McKenzies Books in Order

The Mighty McKenzies are connected romantic suspense novels involving the McKenzie family and law-enforcement danger. Read them in order for the family structure.

  1. Smoky Mountains Ranger (2019): Ranger Adam McKenzie protects Jody Ingram through a dangerous mountain escape while gunmen close in.
  2. Smokies Special Agent (2019): FBI agent Remi Jordan and investigator Duncan McKenzie pursue a kidnapper tied to Remi’s past.
  3. Conflicting Evidence (2020): Peyton Sterling turns to U.S. Marshal Colin McKenzie to prove her brother’s innocence after a prison escape reopens old wounds.
  4. Undercover Rebel (2020): Ian McKenzie hides his Homeland Security identity while working a human-trafficking case that puts Shannon Murphy in danger.

The Justice Seekers Books in Order

The Justice Seekers books follow an organization built around difficult investigations and unfinished justice. Publication order is recommended.

  1. Cowboy Under Fire (2020): Former cop Dalton Lynch joins the Justice Seekers and helps Hayley Nash investigate her friend’s death.
  2. Agent Under Siege (2021): Former profiler Bryson Anton helps Teagan Ray question whether the imprisoned Kentucky Ripper is really the man who abducted her.
  3. Killer Conspiracy (2021): Gage Bishop must protect Harper Manning and search for the child he never knew had survived.
  4. Deadly Double-Cross (2021): Justice Seekers leader Mason Ford becomes the target of a destroy-him-from-the-inside plot, with crime scene analyst Hannah Cantrell trying to keep him alive.

Tennessee Cold Case Books in Order

This is one of Diaz’s clearest later-series starting points. The cold-case firm and Smoky Mountains setting connect the books, so order helps.

  1. Murder on Prescott Mountain (2022): Former soldier Grayson Prescott and Detective Willow McCray connect his haunted cold-case mission to her serial-killer investigation.
  2. Serial Slayer Cold Case (2022): Detective Bree Clark and PI Ryland Beck reopen the Smoky Mountain Slayer case after an old failure becomes active again.
  3. Shrouded in the Smokies (2023): Skylar Montgomery, presumed dead for five years, turns to widowed ex-cop Adam Trent when her hidden life becomes dangerous again.
  4. The Secret She Keeps (2023): Raine Quintero kidnaps PI Callum Wright in a desperate attempt to save her brother from execution and expose another killer.
  5. Smoky Mountains Graveyard (2024): Faith Lancaster and Asher Whitfield uncover a burial ground while working a cold case tied to a missing young woman.
  6. Smoky Mountains Mystery (2024): Officer Keira Sloane brings Lance Cabrera a decades-old case that collides with a fresh murder and secrets from his own past.

A Mystic Lake Mystery Books in Order

Mystic Lake is Diaz’s newest active series. These are listed as stand-alone romantic suspense mysteries with publication order recommended.

  1. Hunting the Crossbow Killer (2025): FBI agent Grace Malone suspects Aidan O’Brien in the Crossbow Killer case, then accepts his help as the investigation and attraction tighten.
  2. Vanished in the Mist (2025): Private investigator Shanna Hudson searches for a missing teen near Mystic Lake and finds a deeper mystery with Kaden Rafferty.
  3. The Lawman’s Deadly Bargain (2026): Former police chief Beau Dawson becomes involved in Sierra Covington’s search for her brother’s killer, even though her family ties make trust difficult.
  4. Cold Case Conspiracy (2026): Listed as the fourth Mystic Lake Mystery, this upcoming entry continues the series’ cold-case and small-town danger pattern.

Standalone Lena Diaz Novels

These do not need to be read before the series. They are good choices when you want one complete romantic suspense story.

  1. The Marshal’s Witness (2013): U.S. Marshal Ryan Jackson goes on the run with protected witness Jessica Delaney while searching for the mole who exposed her identity.
  2. The Bodyguard (2014): Caroline Ashton hires Luke Dawson for protection after escaping an abusive marriage, only to become entangled in a murder investigation.

Multi-Author Series and Collections

These are not required for the main Lena Diaz series. Treat them as optional unless you are following the larger publisher line.

  1. Murder, Secrets, Kisses, and Lies (2014): A multi-author collection, useful for completists but not part of a Diaz-only series order.
  2. Police Dog Procedural (2022): Diaz’s contribution to the K-9s on Patrol multi-author series, centered on a police-dog procedural setup rather than her core series continuity.
  3. The Sinful Sleuths Club Collection (2026): A multi-author collection listing that includes Diaz-related material, best treated as a buying-format or shared-world item rather than a new main-series step.

Collections and Omnibus Editions

Lena Diaz’s books appear in many Harlequin bundles, two-in-one editions, box sets, and reprint collections.

Do not add those bundles into the reading order as separate stories. Use them only to collect the original books.

For example, a bundle that includes The Marshal’s Witness still belongs where The Marshal’s Witness belongs. A bundle that includes Agent Under Siege does not create a new Justice Seekers book.

Complete Publication Order

This is useful for collectors, but most readers should use series order instead.

  1. He Kills Me, He Kills Me Not (2011): Diaz’s debut romantic suspense novel and the opening Deadly Games book.
  2. Simon Says Die (2012): The second Deadly Games novel, continuing the nursery-rhyme killer pattern.
  3. The Marshal’s Witness (2013): A standalone U.S. Marshal protection story.
  4. Explosive Attraction (2013): The first Morgan Brothers book, built around a bomb technician and a killer’s timed game.
  5. Ashes, Ashes, They All Fall Dead (2013): The third Deadly Games book, with FBI investigation and buried memory at the center.
  6. Undercover Twin (2013): The second Morgan Brothers book, using mistaken identity and undercover rescue.
  7. Tennessee Takedown (2014): A Tennessee SWAT prequel involving a framed accountant and a protective SWAT leader.
  8. The Bodyguard (2014): A standalone bodyguard romantic suspense novel.
  9. Take the Key and Lock Her Up (2014): The fourth Deadly Games book and a bridge into EXIT Inc. material.
  10. Murder, Secrets, Kisses, and Lies (2014): A multi-author collection rather than a necessary series installment.
  11. Exit Strategy (2015): The first EXIT Inc. thriller.
  12. Missing in the Glades (2015): The first Marshland Justice book.
  13. Arresting Developments (2015): The second Marshland Justice book.
  14. No Exit (2016): The second EXIT Inc. thriller.
  15. Deep Cover Detective (2016): The third Marshland Justice book.
  16. Hostage Negotiation (2016): The fourth Marshland Justice book.
  17. Mountain Witness (2017): The first numbered Tennessee SWAT book.
  18. Secret Stalker (2017): The second numbered Tennessee SWAT book.
  19. Final Exit (2017): The third EXIT Inc. thriller.
  20. Stranded with the Detective (2018): The third numbered Tennessee SWAT book.
  21. SWAT Standoff (2018): The fourth numbered Tennessee SWAT book.
  22. Smoky Mountains Ranger (2019): The first Mighty McKenzies book.
  23. Smokies Special Agent (2019): The second Mighty McKenzies book.
  24. Conflicting Evidence (2020): The third Mighty McKenzies book.
  25. Undercover Rebel (2020): The fourth Mighty McKenzies book.
  26. Cowboy Under Fire (2020): The first Justice Seekers book.
  27. Agent Under Siege (2021): The second Justice Seekers book, with some listings using late-2020 metadata.
  28. Killer Conspiracy (2021): The third Justice Seekers book.
  29. Deadly Double-Cross (2021): The fourth Justice Seekers book.
  30. Murder on Prescott Mountain (2022): The first Tennessee Cold Case book.
  31. Serial Slayer Cold Case (2022): The second Tennessee Cold Case book.
  32. Police Dog Procedural (2022): Diaz’s K-9s on Patrol contribution.
  33. Shrouded in the Smokies (2023): The third Tennessee Cold Case book.
  34. The Secret She Keeps (2023): The fourth Tennessee Cold Case book.
  35. Smoky Mountains Graveyard (2024): The fifth Tennessee Cold Case book.
  36. Smoky Mountains Mystery (2024): The sixth Tennessee Cold Case book.
  37. Hunting the Crossbow Killer (2025): The first Mystic Lake Mystery.
  38. Vanished in the Mist (2025): The second Mystic Lake Mystery.
  39. The Lawman’s Deadly Bargain (2026): The third Mystic Lake Mystery.
  40. The Sinful Sleuths Club Collection (2026): A multi-author collection listing, not a core Diaz series novel.
  41. Cold Case Conspiracy (2026): The fourth Mystic Lake Mystery and the latest upcoming series entry found for this update.

Recommended Reading Order

For the cleanest Lena Diaz experience, do not start with a full publication-order marathon. Start with the tone you want.

For darker serial-killer romantic suspense:

  1. He Kills Me, He Kills Me Not (2011): The best entry into Diaz’s early suspense voice.
  2. Simon Says Die (2012): Keeps the Deadly Games structure moving.
  3. Ashes, Ashes, They All Fall Dead (2013): Adds FBI stakes and memory-driven danger.
  4. Take the Key and Lock Her Up (2014): Connects the Deadly Games arc to the EXIT Inc. world.

For action-thriller romantic suspense:

  1. Exit Strategy (2015): Starts the EXIT Inc. conspiracy.
  2. No Exit (2016): Broadens the organization-level threat.
  3. Final Exit (2017): Finishes the trilogy’s central pursuit.

For newer Harlequin Intrigue readers:

  1. Murder on Prescott Mountain (2022): Opens the Tennessee Cold Case sequence.
  2. Serial Slayer Cold Case (2022): Builds the cold-case firm structure.
  3. Shrouded in the Smokies (2023): Continues the Smoky Mountains suspense pattern.
  4. The Secret She Keeps (2023): Adds a race-against-time legal and investigative case.
  5. Smoky Mountains Graveyard (2024): Pushes the series into buried-body cold-case territory.
  6. Smoky Mountains Mystery (2024): Completes the listed Tennessee Cold Case run.

For the newest active line:

  1. Hunting the Crossbow Killer (2025): Begins Mystic Lake.
  2. Vanished in the Mist (2025): Expands the lake setting and investigative network.
  3. The Lawman’s Deadly Bargain (2026): Continues the series with a former police chief and a dangerous bargain.
  4. Cold Case Conspiracy (2026): Continue here when book four is available.

Chronological Order

There is no useful single chronological order for all Lena Diaz books.

The series are separate enough that a full timeline would create more confusion than clarity. The better rule is to read each series in publication order.

The only special placement is Tennessee Takedown. Read it before Mountain Witness if you want all Tennessee SWAT material, but understand that Diaz’s own site labels it as a prequel rather than a numbered book one.

Latest Release Status

As of this update, A Mystic Lake Mystery is the newest active Lena Diaz series.

The Lawman’s Deadly Bargain is book three of Mystic Lake and is listed for 2026.

Cold Case Conspiracy is listed as Mystic Lake book four with late-2026 cataloging.

The official Lena Diaz site lists Mystic Lake book four as “Coming soon,” while catalog pages identify it as Cold Case Conspiracy.

FAQs

What Lena Diaz book should I read first?

Start with He Kills Me, He Kills Me Not for her early romantic suspense, Exit Strategy for the EXIT Inc. thrillers, or Hunting the Crossbow Killer for her newest series.

Are Lena Diaz’s books connected?

They are connected within their own series. Deadly Games, EXIT Inc., Tennessee SWAT, Tennessee Cold Case, Mystic Lake, and the other named series should each be read in order.

Is Tennessee Takedown book one of Tennessee SWAT?

It is best treated as a prequel. Read Tennessee Takedown first, then begin the numbered Tennessee SWAT books with Mountain Witness.

Is Take the Key and Lock Her Up part of EXIT Inc.?

It is listed as Deadly Games book four, but it also introduces EXIT Inc. material through Devlin Buchanan. Read it before the EXIT Inc. trilogy if you want the smoothest bridge.

Are Lena Diaz’s Harlequin Intrigue books stand-alone?

Many have self-contained romantic suspense plots, but the named series still work better in publication order because settings, teams, and family structures recur.

Do I need the omnibus editions?

No. Omnibus editions and Harlequin bundles are buying formats. They do not add new reading-order steps unless they contain a separate original story.

What is Lena Diaz’s newest series?

The newest active series is A Mystic Lake Mystery, beginning with Hunting the Crossbow Killer.

Conclusion

Read Lena Diaz by series, not by one giant universal timeline.

For the strongest early-series start, choose He Kills Me, He Kills Me Not. For rogue-operative suspense, choose Exit Strategy. For cold cases, choose Murder on Prescott Mountain. For the newest ongoing line, begin with Hunting the Crossbow Killer and follow Mystic Lake in order.

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Frank is the editor of BookSeries.blog, focusing on publication order, chronological timelines, and spoiler-free reading guides for book series and fictional universes.

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