In this little horror film, a wealthy sportsman (Calvin Lockhart) invites a house full of guests to a big-game hunt that he's devised. He's sure that one of the guests is a werewolf, and he intends to stalk it, find it, and kill it. As a film viewer, you are alerted at the outset that a mystery awaits and that clues will be unveiled that can point to the identity of the werewolf. In fact, near the conclusion, the film has inserted a 30-second interlude during which you must decide, once and for all, who the hunted beast is. This film is based upon a story by James Blish titled There Shall Be No Darkness.