A satanic leader named Corbis is seeking a book that has the names of people who sol their souls to Satan, and he intends to get the book from a family whose been keeping the book from him for 300 years.
Ernest Borgnine is the incredibly evil Corbis and William Shatner is Mark Preston whom Corbis eventually captures and changes him into an eyeless follower.
Tom Skerritt is Mark's brother, Tom, who then comes searching for him with his wife Julie (Joan Prather). Tom enlists the aid of Dr. Sam Richards (Eddie Albert). Julie is offered as a sacrifice for the devil cult while Tom and Sam find they have way more than they bargained for in fighting Satan.
The ending has almost everyone in the cast melting and it's a very downbeat and twisted ending at that. I have read a lot of very bad reviews about this film and I don't understand why. It's a well made thriller that starts out well and never lets up.
The rest of the cast includes Ida Lupino, Keenan Wynn, John Travolta and Lisa Todd as Lilith, Queen Of Delights. I love the print from Dark Sky, it's the best I have ever seen this film looking. Recommended!!