The film follows a riot squad that enters an insane asylum to try to deal with a hostage situation involving some of the inmates. The group is quickly overwhelmed by the patients, who quickly attack the squad members. The resulting chaos causes the group to lose two of their members and the situation turns more tense when they realize that they are completely cut off from the outside world. Not only are all of the doors locked, but none of their communication devices seem to work properly. It is at this point that they realize that they aren't fighting against normal mental patients, but ones that have been possessed by a dark and evil force. Things take a darker turn when one group member discovers that the leader of this group is his own brother.

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