Glamorous American jewel-thief Sophie Lang (Gertrude Michael) not only regularly outwits Scotland Yard, but has great fun doing it. Returning to the U.S., Sophie comes under the scrutiny of New York detective Inspector Parr (Arthur Byron), who surprisingly doesn't try to make an arrest. That's because Parr is hoping that European jewel-thief Max Bernard (Paul Cavanaugh) will lead him to Sophie, who will then theoretically lead Parr to a gang of more dangerous criminals. Max and Sophie spend the rest of the picture chasing each other around, ultimately falling in love and promising that they'll reform. This bit of folderol was popular enough to yield a brace of sequels, The Return of Sophie Lang and Sophie Lang Goes West.