Inspector Bob Deering (Barry MacKay) is on the trail of 'Sparkle' an international jewel thief. He meets a newspaper reporter Pat (Jessie Matthews) who is writing a story about a film star and obtaining information by pretending to be her maid. When she accepts an invitation from Bob for an evening out she is sacked and*to save her reputation she steals a necklace. Unfortunately the necklace actually belongs to a friend of Bob and leads him to suspect that Pam is actually the elusive 'Sparkle'. His personal and professional beliefs collide*but which will he listen to?