When all communication with a remote military base situated in an area of intense guerrilla activity is lost, a unit of soldiers is sent on a mission to regain contact with their brothers-in-arms. Fearing the base has been taken over by enemy forces, they arrive to find the place littered with corpses and the walls daubed with blood and what appear to be magical symbols intended to ward off evil. Confused and isolated, the soldiers find themselves gripped by inexplicable feelings of fear, mistrust and paranoia that leads them to question the nature and identity of their enemy.