Characters in The Madness of Crowds

Armand Gamache

Chief Inspector of homicide, forced to protect a speaker whose argument he finds monstrous.

Also in Still Life, The Cruelest Month, The Murder Stone, The Brutal Telling, Bury Your Dead, A Trick of the Light, The Beautiful Mystery, How the Light Gets In, The Long Way Home, The Nature of the Beast

Abigail Robinson

A statistics professor whose data-driven lecture gathers a dangerous following.

Jean-Guy Beauvoir

Gamache's son-in-law and second-in-command, back from Paris.

Also in Still Life, Bury Your Dead, A Trick of the Light, The Beautiful Mystery, How the Light Gets In, The Nature of the Beast, A Great Reckoning, Glass Houses, Kingdom of the Blind, A Better Man

Reine-Marie Gamache

Gamache's wife.

Also in The Cruelest Month, The Murder Stone, How the Light Gets In, The Long Way Home, The Nature of the Beast, A Great Reckoning, Glass Houses, Kingdom of the Blind, All the Devils Are Here, The Grey Wolf

Ruth Zardo

The village poet.

Also in Still Life, Bury Your Dead, A Trick of the Light, How the Light Gets In, The Long Way Home, The Nature of the Beast, A Great Reckoning, Glass Houses, Kingdom of the Blind, A World of Curiosities