Nick and Brian compete to capture a French criminal who is involved in a vintage wine scam and a plot to counterfeit franc notes, their paths lead to a dungeon in the villain's Napa Valley monastery. Brian Devlin poses as a monk as he and his private investigator son, Nick Corsello, investigate a big swindle involving fine wines.

Brian inadvertently becomes involved in a "Maltese Falcon"-style murder mystery. Lady Buffy St. Clair has donated $ 1 million to the Cultural Center. Brian Devlin wants to thank her with a small gift. For this purpose, he is looking for a friendly jeweler. Moments later, Devlin is involved in a murder case ...