The Madness of Crowds

Ewen Cameron was a psychiatrist at McGill University in the mid-20th century. He studied brainwashing by conducting unethical experiments on patients without consent: They came to him seeking help for depression and anxiety. Reine-Marie and Jean-Guy are shocked that Vincent Gilbert could potentially have been involved in these experiments since Gilbert subsequently devoted his professional and personal life to advocating for human dignity. Meanwhile, in Three Pines, Lacoste questions Haniya about her past. Haniya describes being abducted as a child and then being tortured and habitually raped before she escaped. Haniya openly admits that she killed multiple people while escaping, and in revenge.

Gamache, Lacoste, Jean-Guy, and Myrna reunite in Three Pines. Lacoste tells them what Haniya shared and explains that she believes Haniya would be willing to kill someone if she believed she was protecting innocent people. Haniya is a serious suspect in the murder of Debbie: She may have been trying to kill Abigail and killed Debbie by accident. Jean-Guy shares his discovery that Vincent Gilbert worked with Ewen Cameron, while Gamache confirms that Simon was his father’s accomplice and remains a suspect in Debbie’s murder.