For the first time in his career with both the Boston cops and General Ike, it looks like Lieutenant Billy Boyle has encountered a serial killer. Two American officers stationed in Italy have been found murdered. The MOs are different, but one thing links them -- each body was discovered with a single playing card: the Lieutenant, the ten of hearts; the Captain, the jack of hearts. The message seems to be clear. If the murderer isn't apprehended, the higher ranks will be next.