The National Gallery houses priceless art treasures belonging to the nation and has high security. But Velazquez's painting “The Prince” is nevertheless stolen. Commander George Gideon of Scotland Yard knows of only a few thieves at large artful enough to pull off such a heist. However, one obvious suspect turns up dead and Gideon believes there is more to the story than a simple theft, no matter how daring. Then a famous art dealer's daughter is kidnapped and a notorious counterfeiting ring moves into town. Clearly, Gideon is facing something both major and mysterious . . .