Specialists gather in a top-secret facility to investigate a series of strange deaths on beaches along the Atlantic Ocean. One of the team's scientists (Nana Gouvea) examines video evidence to uncover a possible parasitic explanation for the fatalities. But when a determined detective (Tom Sizemore) sends her the crazed writings of a mysterious homeless man (Jonny Beauchamp), the scientist slowly learns that the actual threat may be more dangerous -- and far older -- than anyone ever imagined. Can she convince her colleagues (led by Eric Roberts) of the true danger before an ancient force rises from the sea to bring madness and death to all of humanity?

布洛克（杰森·斯坦森 Jason Statham 饰）的灰暗过往令他不得不携家带口过起了离群索居隐姓埋名的生活，和从前经历的大风大浪相比，如今和家人待在一起的平静日子显得尤为可贵。然而，现实却不愿轻易放过布洛克，一场意外的冲突让毒枭盖特（詹姆斯·弗兰科 James Franco 饰）在无意之中发现了布洛克的真实身份，布洛克好不容易构筑起的安稳即将毁于一旦。
　　盖瑞找来了前女友雪莉（薇诺娜·瑞德 Winona Ryder 饰），在小镇之中散布着搅乱人心的流言蜚语，一时间，矛头全部指向了布洛克一家人，此时唯一信任和支持布洛克的，只有布洛克的女儿和她的老师。与此同时，盖瑞此举亦将自己推上了一条不归路。