Patriarch Steve Preston goes missing and worried mom Emma (Ida Lupino) sends eldest son Mark (William Shatner) in search of his father. Suddenly, a dying, eyeless Steve returns and demands that the family: "Give Corbis what belongs to him!" before dissolving into a gelatinous meltdown. Corbis (Ernest Borgnine) is a Satanic priest hell-bent on recovering a valuable book listing the names of those who sold their souls to the devil.a book that resides with the Preston family. Mark refuses to hand it over and puts up a brave fight, only to wind up an unwilling sacrifice.