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The greatest theatre in Paris will host a performance by Marie Le Belle, Josephine's mistress. So the Siamese cat's friends are invited as guests of honour. But right after the first act, there is a commotion! Someone has stolen Marie's precious earrings. The thief acted very professionally, leaving no trace for the police. But not for the cats. Armed with an exceptional sense of smell, the whiskered detectives get to work.