Jason, is bit by a strange organism while on vacation with his girlfriend, Sam, at her sister's secluded farmhouse. The bite begins a transformation in Jason, and now the couple must race against time to figure out what happened to Sam's sister and her family, and what lies in store for them. All of these elements are tantamount to the ultimate fear addressed in the film, the fear of losing a loved one and worse, becoming a monster in their eyes.

Jason wird während eines Urlaubstrips zur abgelegenen Farm seiner Freundin von einem seltsamen Organismus gebissen. Der Biss löst eine Transformation in Jason aus. Damit beginnt für das Pärchen ein Rennen gegen die Zeit. Die beiden müssen herausfinden, was mit der Schwester und ihrer Familie passiert ist und ob dasselbe nun auch ihnen blüht. Jason sorgt sich nun nicht nur darum, seine geliebte Freundin zu verlieren, sondern in ihren Augen zum Monster zu werden...

샘과 제이슨은 도시 생활을 접고 아이들을 위해 교외로 이사한 언니 부부의 집을 찾아간다. 하지만 막상 언니 집에는 아무도 없고, 두 사람이 근처 호수에서 수영을 즐긴 후 이상한 일들이 벌어진다.