This low-budget horror film had an innovative concept, mixing rather successfully a traditional Agatha Christie-type murder mystery with a "gory" werewolf flick; the result does hold your attention but is marred by wooden acting (except for the excellent Peter Cushing) and a few overextended chase scenes. As another reviewer noted, no real clues are given to us to help us figure out the identity of the werewolf, so it's strictly a matter a guessing, but there is some fun in the game... (**1/2)