Murder Off the Books — Evelyn David

A retired Irish Cop and a fast-food loving Irish Wolfhound search for the campus murderer while dealing with a scooter-riding senior with dreams of trenchcoat adventures, a crazed exterminator looking for his ride, and a makeup artist whose mid-life crisis isn't any the less stressful because her clients never complain. A half-million dollars has vanished and a college comptroller is dead. Mackenzie Sullivan, recently retired DC cop and newly-minted private detective, really has no interest in the murder. Mac just needs to find the embezzled money for the university's insurance company. Finding the killer is a bonus that he's not sure he wants to earn.