Frankie Donovan finally settles down. With his girlfriend Kate and that little boy Alex, he finally has some kind of family. But things are far from perfect. The social services are after Alex since his drug-addict mom left him. Frankie, or FD as he calls him, is the closest thing to a father for Alex and he doesn't need another home. But the law says different things.
Two bodies have been found in a hotel room. Brutally killed, the two bodies of the lovers are found with a note. It seems that there is a serial killer on sight.
Getting on and on with the investigation, Frankie involves himself into a puzzle that seems it can not be solved. When the things get tough, friends are there for help, one particularly. That's all about: friendship, family, honor.