Mary Florescu (Sophie Ward) and Reg Fuller (Paul Blair), experts in the supernatural, are enlisted to probe strange happenings at a family's home. Joining them is Simon McNeal (Jonas Armstrong), a young student who has a gift for interacting with the spirit world. After staying the night in the eerie dwelling, they discover indecipherable writing on the walls, and Simon finds strange scars all over his body. As their investigation continues, the nightmare deepens.