House Reckoning by Mike Lawson

Book 9 is steady and enjoyable like the first 8 books. PW Joe DeMarco always knew that his father, Gino, had a shady job for a local mafioso, but he didn't understand that Gino had been a hit man until he was murdered. Now, nearly 20 years later, one of Gino's former mob associates is dying of lung cancer, and he wants to get something off his chest before retiring to his grave: the truth about Gino's killer. The shocking information, and the powerful position the killer now occupies, sends DeMarco on a mission of revenge with terrible consequences.