Sandra Carpenter (Lucille Ball) is an American taxi-dancer living in London whose roommate has disappeared. The missing girl had left to answer a job offer in the "personal" column of the Times, just like several other women who've vanished without a trace.
Scotland Yard detective George Zucco suggests that Sandra answer the personals herself in hopes trapping the killer. She crosses the paths of several eccentrics, including deranged artist (Boris Karloff), who for a brief time is the prime suspect.
The actual culprit, a sex murderer, is the least likely and most helpful of Sandra's contacts, a fact that she learns almost too late.
Special Notes: Although Boris Karloff is billed fourth in the credits, he only appears in one scene. According to a Hollywood Reporter news item, Lucille Ball "collapsed on the set" of the film, shutting down production for three days.