The Spring — Clifford Irving

The hamlet of Springhill nestles high in the Colorado Rockies. Residents are bursting with health, but they guard a secret: they grow old very, very slowly...and they decide when to die. When Manhattan attorney Dennis Conway falls in love with Springhill's mayor, Sophie Henderson, he and his two children move in with her. He's charmed by her parents, Scott and Bibsy, and by Harry Parrot, the town drunk/artist, but curious about the Water Board, an entity that wields great power over the townsfolk. When his in-laws are accused of illegally assisting in the suicide of two friends, he agrees to represent Bibsy.