Explorers in Mexico discover the dismembered hand of an ancient demon in an old silver mine which a has the ability to possess people. Stuart Whitman plays a priest who teams up with Samantha Eggar (The Brood) to destroy it by performing an exorcism. Alfredo Zacarias wrote and directed this co-production between Mexico and the USA (aka Demonoid: Messenger of Death and Macabra), which for a movie about demonic possession featuring lots of killer hands running around comes across like a really boring episode of TV's Fantasy Island.