Nine years after the tragic events of Hell House, the Abaddon Hotel will once again be open to the public. Billionaire Russell Wynn has taken his audience-interactive show, Insomnia, into the abandoned hotel. Russell invites journalist Vanessa Shepherd to film an exclusive behind-the-scenes documentary of the production. What she uncovers will shed light on Russell's true intentions for relocating his show to the Abaddon and the evil waiting to be unleashed.

Five years after an unexplained malfunction causes the death of 15 tour-goers and staff on the opening night of a Halloween haunted house tour (Hell House), a documentary film crew visits the scene of the tragedy to investigate what really happened that night.