Gloria's just lost her family in an accident. Cameron's afraid of what isn't there. Samira hasn't spoken in weeks. Adrian is haunted by his past, and Han Yun has a problem he can't seem to control.

Six lives are about to change forever, and only one of them knows why. When college student Marnie Lundberg is given the chance to perform an experiment on her friends, she opts to use her position to address one question: can she force her group of friends into a state of psychosis? With the help of questionable characters, deception, and fragile mental states, Marnie takes over her friends' lives one by one, until there may be no one left to mess with.