A group of cold case investigators stay at the Carmichael Manor, site of the grisly and unsolved murders of the Carmichael family back in the eighties. After four nights, the group was never heard from again. What is discovered on their footage is even more disturbing than anything found on the Hell House tapes.

After a near-death experience, Vanessa Shepherd faces nightmares in Abaddon. As mysterious deaths occur around her, she discovers her connection to the Abaddon Hotel, Carmichael Manor, and decades of unexplained murders.