The Beast Must Die

Millionaire Tom Newcliffe (Calvin Lockhart) invites a group of people to spend some time in his rural English mansion, along with his wife Caroline (Marlene Clark) where he reveals that one of them is a werewolf, and therefore must be killed. The entire house is under surveillance by CCTV cameras as well as motion sensors in the grounds around the mansion set up and overseen by Tom's associate Pavel (Anton Diffring), who doesn't believe in werewolves. The only way to determine the identity of the werewolf is by for a certain combination of elements to occur all at once, such as