A $1 million painting is stolen from a museum in Kansas City, Missouri. The thieves initially plan to sell it to a collector in Europe. But when that buyer dies in an accident, they instead seek to sell it back to the museum. Inspector Erskine poses an art expert who the thieves will call upon to confirm the painting is genuine. But what Erskine doesn't know is that he arrested one of the thieves, who has been working in the museum as a volunteer, eight years earlier.