Sent to a village south of Montreal to investigate the death of CC de Poitiers, an extremely unpopular woman apparently killed in an electrical accident, Armand Gamache of the Surete du Quebec finds that nearly everyone in town had a motive to kill her.

It's Gamache's first day back as head of the homicide department, a job he temporarily shares with his previous second-in-command, Jean-Guy Beauvoir. Flood waters are rising across the province. In the middle of the turmoil a father approaches Gamache, pleading for help in finding his daughter. As crisis piles upon crisis, Gamache tries to hold off the encroaching chaos, and realizes the search for Vivienne Godin should be abandoned. But with a daughter...