A murder investigation disrupts the peace of a beautiful Quebec town. When a beloved schoolteacher is found dead, the possibility of murder leaves the quaint town of Three Pines aghast in this crime drama based on the award-winning novel by Louise Penny. Chief Inspector Armand Gamache arrives with Inspector Jean-Guy Beauvoir to investigate the strange death. With the aid of the victim's best friend, Clara Morrow, they begin to unravel sordid secrets, upending life in the seemingly utopian village. While Clara becomes increasingly involved in helping the inspectors, newcomer Agent Yvette Nichol challenges Gamache with some unconventional theories of her own. Then Gamache faces an ethical dilemma that puts him in an uncomfortable spot with both his superiors and subordinates. Can he find the killer and restore the village to its idyllic state before another murder occurs?