Gilly Macmillan Books in Order (Updated February 19, 2026)

Gilly Macmillan writes psychological suspense that’s mostly standalone, plus a short, clearly numbered DI Jim Clemo mini-series. If you want to avoid even mild character-history spoilers, only one part needs an order: Jim Clemo.

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If you like this… start with this (like the screenshot)

• A child goes missing and the fallout hits a family hard: What She Knew (aka Burnt Paper Sky)
• A “perfect” teenager with a frightening secret: The Perfect Girl
• A school community where the past won’t stay buried: Odd Child Out
• A body, a missing child, and a family story that won’t add up: I Know You Know
• A long-ago tragedy returning through a household you can’t fully trust: The Nanny
• A TV journalist’s life unraveling under scrutiny: To Tell You the Truth
• A weekend away that turns into a social pressure-cooker: The Long Weekend
• A house with a history and a present that feels staged: The Fall (US title: The Manor House)
• You want the newest release: The Burning Library (publication timing varies by region)

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Reading map in one glance

• DI Jim Clemo books: read in order (they share continuity).
• Everything else: read anytime (standalones).

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DI Jim Clemo (read in order)

1. What She Knew (aka Burnt Paper Sky): A child’s disappearance detonates a family’s assumptions and introduces DI Jim Clemo’s world.
2. Odd Child Out: A school-linked case with buried history continues Clemo’s storyline and lands best after book one.

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Standalone novels (publication order, one line each)

• The Perfect Girl (2016): A private-school scandal turns lethal, and “good parenting” becomes part of the mystery.
• I Know You Know (2018): A family moves toward a fresh start until new evidence suggests the past never ended.
• The Nanny (2019): A return of a former nanny forces a family to relive, and re-litigate, an old tragedy.
• To Tell You the Truth (2020): A journalist’s public collapse becomes a trap when someone decides to control the narrative.
• The Long Weekend (2022): A friend-group getaway turns into a claustrophobic game of secrets, alliances, and blame.
• The Fall (US: The Manor House) (2023): A country-house setting hides modern motives, and the “safe place” becomes the threat.
• The Burning Library (US/Canada 2025; UK 2026): A new suspense novel built around what’s preserved, what’s destroyed, and what people will do to keep a story from surfacing.

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Recommended order (so you don’t overthink it)

• Most common starting point: What She Knew → Odd Child Out (then jump anywhere).
• If you only want standalones: start with The Perfect Girl or The Long Weekend, then pick by premise.
• If you prefer newest first: The Burning Library → then The Fall / The Manor House → then work backward.

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FAQs

Are any of Gilly Macmillan’s books a long series?
No. The only clear series is DI Jim Clemo, and it’s two books.

Why do I see two titles for the same book?
Some novels have UK/US title variants (notably What She Knew / Burnt Paper Sky and The Fall / The Manor House). It’s the same story under different market titles.

What’s the latest book right now?
As of this update, The Burning Library is listed as the most recent release, with publication timing differing by region.

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Conclusion

If you want the safest “in order” path, read What She Knew and then Odd Child Out. After that, treat the rest as true standalones and choose by whichever premise sounds most uncomfortable, in the best way.

Research notes (not part of the article): bibliographies and title-variant checks were cross-referenced using the author’s official site plus multiple series/bibliography databases (including Fantastic Fiction and Goodreads) to confirm the DI Jim Clemo order, standalone list, and the regional timing for The Burning Library.