After losing his brother in combat, Jacob Singer returns home from Afghanistan -- only to be pulled into a mind-twisting state of paranoia. Singer soon realizes that his sibling is alive but life is not what it seems.

While driving through the New Mexico Desert during a rainy night, college students Jim Halsey and his girlfriend Grace Andrews give a ride to a hitchhiker. While in their car, the stranger proves to be a psychopath threatening the young couple with a knife, but Jim successfully throws him out of the car. This sets off a chain of events that will change all of their lives forever.

A group of friends head to a deserted Caribbean island for a surprise overnight bachelor party only to discover that the island isn't deserted. It's actually the home to a secret medical facility. Not only that, there's something wrong with the water surrounding the island...