The Recurring Cast
Character · Gamache and the Sûreté · 21 books

Isabelle Lacoste

Detective, later head of homicide · Louise Penny

Isabelle Lacoste is a homicide detective on Gamache’s team, calm, perceptive and good at getting suspects to talk. She grows into one of the most capable officers in the Sûreté.

Spoiler-free profile written for The Recurring Cast.

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Character facts

First appearance
Still Life (2005)
Latest appearance
Miss Wolcott’s Ghost (2026)
Books
21 (21 major)
Series
Armand Gamache
Author
Louise Penny
Circle
Gamache and the Sûreté

Where to meet Isabelle Lacoste

Isabelle Lacoste first appears in Still Life (2005), in a major role, book 1 of the Armand Gamache series.

Buy Still Life

Every book with Isabelle Lacoste

In publication order, with the size of their role in each.

  1. 2005MStill Lifemajor role · Armand GamacheBuy
  2. 2006MA Fatal Gracemajor role · Armand GamacheBuy
  3. 2007MThe Cruellest Monthmajor role · Armand GamacheBuy
  4. 2008MA Rule Against Murdermajor role · Armand GamacheBuy
  5. 2009MThe Brutal Tellingmajor role · Armand GamacheBuy
  6. 2010MBury Your Deadmajor role · Armand GamacheBuy
  7. 2011MA Trick of the Lightmajor role · Armand GamacheBuy
  8. 2012MThe Beautiful Mysterymajor role · Armand GamacheBuy
  9. 2013MHow the Light Gets Inmajor role · Armand GamacheBuy
  10. 2014MThe Long Way Homemajor role · Armand GamacheBuy
  11. 2015MThe Nature of the Beastmajor role · Armand GamacheBuy
  12. 2016MA Great Reckoningmajor role · Armand GamacheBuy
  13. 2017MGlass Housesmajor role · Armand GamacheBuy
  14. 2018MKingdom of the Blindmajor role · Armand GamacheBuy
  15. 2019MA Better Manmajor role · Armand GamacheBuy
  16. 2020MAll the Devils Are Heremajor role · Armand GamacheBuy
  17. 2021MThe Madness of Crowdsmajor role · Armand GamacheBuy
  18. 2022MA World of Curiositiesmajor role · Armand GamacheBuy
  19. 2024MThe Grey Wolfmajor role · Armand GamacheBuy
  20. 2025MThe Black Wolfmajor role · Armand GamacheBuy
  21. 2026MMiss Wolcott’s Ghostmajor role · Armand GamacheBuy

Appears most often with

CharacterBooks together
Armand GamacheChief Inspector of homicide, Sûreté du Québec21
Clara MorrowArtist living in Three Pines21
Gabri DubeauRuns the bed and breakfast with Olivier21
Jean-Guy BeauvoirGamache’s second-in-command, later his son-in-law21
Myrna LandersFormer psychologist who runs the bookshop21
Olivier BruléRuns the bistro with Gabri21