Thriller in which a group of college friends' vacation on a lake island cabin turns into a nightmare when they discover they are surrounded by flesh-hungry sharks. Sara (Sara Paxton) and her friends arrive at her family's Louisiana holiday cabin in good spirits. With the weather as sunny as they'd hoped, they soon venture outside to sunbathe and swim. Things begin to go wrong when football player Malik (Sinqua Walls) emerges from the water with an arm missing. Little do they know what waits in store for them when they set sail across the lake to try and get Malik to a hospital: the group are hunted by what seem like hundreds of sharks and face a desperate battle for survival.