When the adventurous Walter Upton and Hal Harrison set out with the young, but expert guide Louis Woodhull on a canoe trip through the wilderness, they were disappointed to take on an excitable Tenderfoot with them as their fourth. The boys had no idea what sorts of surprises awaited them from Nature, History, and even themselves. Would their training, equipment, and sense of camaraderie be enough to see them safely down Swift River?