Maggie Walsh and her boyfriend Pete Danner, both American architects, are lured to England on a mysterious job offer. After accepting the assignment, they embark on a journey through the English countryside but are involved in a car accident. They are reluctantly taken in by a wealthy and reclusive client named Jason Mountolive, who resides in an imposing and ancient mansion. Stranded and injured, Maggie and Pete become guests at Jason's estate. Joined by five other strangers, they quickly realize that their gathering is no coincidence, as each guest possesses inherited notions, hinted to be the legacy of some dark, ancestral power.

As tensions rise and eerie occurrences become more frequent, Maggie and Pete begin to unravel the mysteries surrounding the mansion and its host. They suspect a sinister plot involving their enigmatic benefactor. The secluded estate slowly reveals its deep-seated secrets, including a disturbing connection to the occult and a harrowing history of Jason's family. Attempts to escape the malevolent grasp of the mansion prove futile, as supernatural forces seemingly conspire to keep them captive. The guests must confront their fears and uncover the true purpose behind their unexpected gathering as survival hinges on unveiling the truth hidden within the mansion’s walls.