Father Dowling has always enjoyed fine art, but someone is going overboard in their role as freelance art critic. A mystery thief is methodically stealing the art treasures that once belonged to the wealthy Cabot family. And Father Dowling has an inkling the thief might be the surviving son, Jonathan. The only question is why would a rich businessman take the risk of stealing the paintings when he could easily afford to buy them outright? And Cabot has perfect alibis for each theft. It looks like it's time for some of Father Dowling's old-fashioned digging for clues.