"Rivers, oceans, streams, lakes - it doesn't matter what shape it takes, Em Hansen is terrified of the water. She hasn't shared her phobia with her new husband, Fritz, and when his best friend, Tiny, organizes a month-long, private, white-water rafting trip through the Grand Canyon as a wedding gift, she can't tell him how awful the trip sounds. Fritz and Tiny cobble together a party of fourteen people for the trip, but at the last minute, Tiny finds...