Plain Clothes (S)

The Ferrett Gang has stolen a diamond necklace. The gang is renting a room from a woman whose daughter is being courted by Harvey Carter, a clueless private eye. Cecile Rhodes, the owner of the necklace, promises Harvey $10,000 if he finds it. The gang thinks Harvey, with his honest face, would be the perfect person to fence the goods. Can Harvey out think the gang, earn his reward, and avoid the wrath of his girl's formidable mother?