During the Vermont flood of 1927, a girl and her grandparents share their new hilltop house with neighbors and animals.

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...