When a satanist cult leader perishes in flames at the hands of a vengeful congregation, he unleashes a supernatural curse upon their bloodlines. Armed with an ancient grimoire of infernal pacts, he returns from beyond to reclaim the souls promised to darkness and bend his descendants to his malevolent will. This occult thriller features the directorial vision of Robert Fuest and an ensemble cast including Ernest Borgnine, Eddie Albert, and Ida Lupino, delivering a chilling exploration of damnation and generational sin rooted in forbidden contracts.