A group of potential heirs gather in a forbidding old house to learn which of them will inherit a fortune. Later, they learn that a flesh-rending maniac is loose.
| Actor | Role |
|---|---|
 Honor BlackmanSusan Sillsby | Susan Sillsby |
 Edward FoxHendricks | Hendricks |
 Michael CallanPaul Jones | Paul Jones |
 Wendy HillerAlison Crosby | Alison Crosby |
 Olivia HusseyCicily Young | Cicily Young |
 Carol LynleyAnnabelle West | Annabelle West |
 Beatrix LehmannMrs. Pleasant | Mrs. Pleasant |
 Daniel MasseyDr. Harry Blythe | Dr. Harry Blythe |
 Wilfrid Hyde-WhiteCyrus West | Cyrus West |
 Peter McEneryCharlie Wilder | Charlie Wilder |