Recovering from the psychological effects of witnessing a brutal crime, FBI agent Jake Malloy (Sylvester Stallone) checks into a rehabilitation clinic for police officers.

There, stripped of their defences, including badges and weapons, they can dry out and begin to face their futures.

However, the therapeutic sanctuary soon becomes a nightmarish prison when a major snowstorm cuts off the clinic from any communication to the outside world.

Patients begin to turn up dead amidst suspicious circumstances and it becomes clear that there is indeed a killer among them.