It is Halloween. Rob, Sean, Beth, and Joe finish up a day of high school. They are seniors. They decide they are going to go to an abonded mansion that a group of three people disappeared at a year ago.
They discover a demon in the mansion that can possess bodies of humans. They have to try to escape the mansion.
They go into the mansion and the door slams behind them. They realize they have been locked inside. Rob and Sean explore upstairs and Joe and Beth explore downstairs. Rob goes into the master bedroom and Sean goes into the guest bedroom. Rob finds a dead body with a loaded gun on it. Rob calls for Sean, but Sean does not answer.
Rob finds the name Beth scratched onto the mirror. Rob runs downstairs and keeps trying to find Sean. Suddenly, he hears Joe yell and Rob runs toward him. Joe tells rob that Beth is dead. He says that her exploded. Rob tells Joe that Sean vanished. He also says he saw beth scribbled out onto a mirror upstairs. He takes out his gun and him and Joe try to find Sean.
Rob finds Joe's name written on the mirror. Rob goes to the man's body to see if there is a gun for Joe. He finds a diary in the man's pocket. It says he saw a demon possess someone in the mansion. Suddenly,Sean walks up the stairs. He looks at Joe and his eyes turn red. Sean has been possessed by the demon! Sean slams Joe into the wall 10 times. He tehn throws him out of the window and Joe dies.
Rob runs and tackles Sean. Rob yells at him to snap out of it. Rob gets thrown into the ceiling fan. Rob takes out his gun and shoots Sean 3 times in the chest. He drops down on and punches him and knocks him out. He runs to the front door and escapes. He gets a massive headache and realizes that he has been possessed