Fake jewels and real jewels get traded around a couple of times in this heist plot featuring Barney as a safecracker with advanced technology, Jim as his bloodthirsty creditor, and Willie leaving the dirty work to others for a change and playing a staid bank representative from the jewels' home country. Lovely criminal Barbara McNair latches onto Barney to steal the jewels for her, intending to send him to his death after the job is completed, despite the flash of romance that sparks between them.