The relationship between Ed, a married astronomer and Amy, his lover, who spend their years apart, is based only on phone calls and texts. One day Amy begins noticing something strange in Ed's messages.

A bigoted junkie cop suffering from borderline personality disorder and drug addiction manipulates and hallucinates his way through the festive season in a bid to secure promotion and win back his wife and daughter.

After a personal tragedy, Sarah joins her friends on a caving expedition in the Appalachian Mountains. But when a rockfall traps them deep underground, their adventure turns into a nightmare. As they search for a way out, the group discovers they are not alone—lurking in the darkness are savage, cave-dwelling creatures. With rising tension and dwindling trust, the women must fight to survive against both the predators and each other.