In a remote mountain lodge, five sorority sisters accidentally unleash an unholy entity, and must battle evil and each other to stop it from devouring mankind.

What starts out as a typical domestic clash quickly turns into a discordant nightmare. Peter seems to have it all: a beautiful wife, a baby on the way, and tow loving friends. They all gather at his cabin for a birthday retreat, but the celebration quickly turns sour as secrets spill out and Peter's mind starts to unravel. Unable to distinguish the truth from his own jealous insecurities, Peter seems to forget even when whose life he is living.