A Pale Moon was Rising

Ireland 1944. A young man's body is pulled from the River Lee. He's wearing a distinctive silver ring that belonged to Paudy Daly, the eldest son of the notorious Mixer Daly. Paudy has been missing for over nine months. Guard Eamon Foley discovers Paudy was last seen on his way to rob the house of pig breeder Jacob Butts. So who is the dead man? And how is he wearing Paudy's ring?