Joey (Leighton Meester) and her brother Gray (Taran Killam) embark on a weekend whitewater rafting trip, but Joey quickly senses trouble when Gray's ex-con friend Trevor (Adam Brody) is invited. She never could have guessed their river adventure would go from dangerous to deadly. Stranded in raging rapids, the terrified rafters desperately fight to keep from capsizing into jagged rocks. Amidst the constant chaos and roaring waves, a saboteur might be risking their lives to ensure startling secrets stay buried. Getting out alive will take killer instincts as everyone discovers how far they're willing to go to survive.