Here’s an odd one: Lucille Ball and Boris Karloff costar in a 1947 thriller by cult director Douglas Sirk (All That Heaven Allows, Written on the Wind). Ball plays an American showgirl in London who agrees to act as a decoy for the police in their hunt for a serial killer. Contrary to the billing, Karloff appears in only a handful of scenes, as a blind date who turns out to be a sinister kook, but they’re pretty entertaining. The balance of the movie relies more heavily on elegant George Sanders, playing a nightclub owner who has eyes for the showgirl but may be the killer himself.