Four young adults go on a multi-state road trip to find the scariest haunted house. After touring several haunted houses, they receive an email with a video inviting them to the world's most terrifying haunted house. They played the video and listened. The video said, "You are invited to enter Nightmare Manor, the scariest place on earth. The most frightening haunted house in the country is only open on Halloween night. Reserved for the bravest souls only. Let it be known that no one has ever completed the tour. If you accept our invitation and arrive at your appointed time, you automatically consent to our agreement. By consenting, you are aware that you may never leave once you enter. We look forward to your eternal damnation." After listening to the invitation, they accepted the challenge.They quickly learn that Nightmare Manor isn't your typical haunted house and soon regret their decision.