For decades, Dick Conant paddled the rivers of America, covering the Mississippi, Yellowstone, Ohio, and Hudson, as well as innumerable smaller tributaries. These solo excursions were epic feats of planning, perseverance, and physical courage. At the same time, Conant collected people wherever he went, creating a vast network of friends and acquaintances who would forever remember this brilliant and charming man even after a single meeting. Ben McGrath, a staff writer at The New Yorker, was one of those people. In 2014 he met Conant by chance just north of New York City as Conant paddled down the Hudson, headed for Florida. McGrath wrote a widely read article about their encounter, and when Conant's canoe washed up a few months later, without any sign of his body, McGrath set out to find the people whose lives Conant had touched - to capture a remarkable life lived far outside the staid confines of modern existence.