This is a fun one starting off at a fancy cocktail party complete with a clairvoyant friend of the Chief's played by Martha Scott ... a painting by Da Vinci on loan from the Louvre is stolen, and Ironpants and crew have to track down the thieves and battle their own superstitious natures. Most of the minimal tension here derives from whether or not some dire predictions for the Chief will come to pass, though the episode moves along at a nice clip and you're caught pleasantly by surprise when everything get's wrapped up and you realize nothing really has happened.
I believe the painting at the center of the caper, "Seraglio" is how they refer to it, I think, is fictional ... did several interweb searches and I can't find any trace of it.