Christian McBurney will tell us about “Machine Guns on Narraganset Bay: The Coast Guard’s War on Rum Runners.” It’s the title of the local historian’s new book. During Prohibition the USCG fired machine guns at rum runners, killing at least four and severely wounding others. Most were local fishermen trying to earn little extra money by supplying bootleg liquor to a market that openly flouted the law. Anne Holst of Cloud’s Hill House Museum on Post Road will add stories of her mother’s adventures and encounters with these same run-runners. The book-signing program will be at Finn’s Harborside restaurant on Water Street at 6 pm.