Taxi dancer Lucy winds up working undercover for Scotland Yard to help uncover a serial killer who preys upon young women, leaving little Baudelaire-based bits of doggerel behind.
Enjoyable mystery based on the 1939 French film Pièges is great for the first hour, but then runs off the rails. There are, as is so often the case with mysteries of this era, too many red herrings. Granted, one of these is Boris Karloff as an insane fashion designer, so that is not really a bad thing.
The real problems lie in the motive of the actual killer. Without trying to give anything away, the killer's professions of love for Ball ring false, especially given the rather overt homosexual subtext that is built up through the film. The killer may be in love with someone, but it isn't Lucy! Now obviously they couldn't do anything given the rigid production code of the time, but it makes the ending sound a false note. Still deserves kudos for some fine acting, especially Zucco, playing against type as a common, crossword-obsessed, copper.