A Better Man by Louise Penny is the fifteenth book in the Chief Inspector Armand Gamache series.
It's Gamache's first day back as head of the homicide department, flood waters are rising across the province. In the middle of this turmoil, a father approaches Gamache, pleading for help in finding his daughter, Vivienne. As crisis piles upon crisis, Gamache tries to hold off the encroaching chaos. With a daughter of his own, Gamache finds himself developing a profound, and perhaps unwise, empathy for Vivienne's distraught father.
