Kristen, a troubled young woman in a 1960s mental institution, finds herself bruised, cut, and drugged. The other patients in the ward offer no answers, and Kristen quickly realizes things are not as they seem. The air is heavy with secrets, and at night, when the hospital is dark and foreboding, she hears strange and frightening sounds. It appears they are not alone. One-by-one, the other girls begin to disappear and Kristen must find a way out before she, too, becomes a victim.