A killer of young women, dubbed Bluebeard, is loose in Paris. Lucille and her friends meet Gaston Morrell, a puppeteer. Lucille suspects he has a tragic past. Meanwhile, his leaving the show with Lucille prompts the jealousy of Renee, Gaston’s sometime lover. Lucille’s younger sister, Francine, comes back to Paris – her boyfriend is Inspector Lefebre, who’s hunting for Bluebeard. Some clues point toward Lamart, a greedy art dealer. Who is in danger, and can Gaston be trusted?