As the summer of 1993 begins, Sam and Swami Brecht roll into town with a 26-foot Winnebago camper van, their three kids, and the deed to Woodchuck Rafting Company. The town of Thunderwater, in Wisconsin’s Northwoods, could be the fresh start their marriage needs. But Woodchuck, once the property of Sam’s eccentric uncle, has seen better days and will need a serious overhaul. Soon Sam and Swami learn they are not the only ones looking for change and profit on the river. A competing rafting outfit, clashing raft guides, stubborn townsfolk and an exploratory mining company begin to threaten their tenuous livelihood. Then nature intervenes, in the form of historic floods throughout the Midwest. Amid tumultuous currents both on and off the river, Sam and Swami struggle to maintain the new life they’ve built.

It’s the summer of 1994 in Claypot, Wisconsin, and the lives of 10-year-old Fischer “Fish” Branson and Dale “Bread” Breadwin are shaped by the two fathers they don’t talk about. One night, tired of seeing his best friend bruised and terrorized by his no-good dad, Fish takes action. A gunshot rings out, and the two boys flee the scene, believing themselves murderers. They head for the woods, where they find their way onto a raft. Four adults track them into the forest: Fish’s mother, Miranda, a wise woman full of fierce faith; his granddad, Teddy, who knows the woods like the back of his hand; Tiffany, a purple-haired gas station attendant and poet looking for connection; and Sheriff Cal, who’s having doubts about a life in law enforcement.