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Good programmer starring Sylvester as a Scotland Yard agent assigned to infiltrate and expose the members of a gang of gem thieves. Unfortunately, Sylvester falls in love with Zetterling, the young widow of one of the gang members, and he develops a camaraderie with the group. When she discovers his true identity and threatens to expose him, Sylvester denounces the police and decides to continue his life of crime. This is not to be, however; later he unwittingly allows the gang to be led right into the hands of the police.