Jewel thieves, operating under the guises of a Duke and a Duchess, hire the Ace Detective Agency, run by Russ Ashton, to baby sit an infant they have kidnapped and are using as a blind. A rival gang of thieves dope the detective sitter, Harvard Quinlan, and make off with a stolen and valuable diamond.... (Full plot summary below)
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Jewel thieves, operating under the guises of a Duke and a Duchess, hire the Ace Detective Agency, run by Russ Ashton, to baby sit an infant they have kidnapped and are using as a blind. A rival gang of thieves dope the detective sitter, Harvard Quinlan, and make off with a stolen and valuable diamond.
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