Jessie and her companions from Downriver have returned to the Grand Canyon, brimming with anticipation about running the big rapids. For Jessie it's a dream come true; for Troy, this trip is his chance to convince the others he's changed. Jessie wants to believe him, but she discovers an alarming secret about his true motives. In the end, the river itself will be the ultimate test. With the water at record levels, all of them -- Jessie, Troy, Adam, Star, Rita, and Pug -- must pull together if they're to survive the thundering rapids and the powerful emotions the river unleashes.