Hawk rehabilitates and, naturally, needs to go after the guys who did it. And, being the kind of guy he is, Spenser must help. Complications ensue, because in Spenserland, you can't just find the bad guys and shoot them. That would have been a real short book. Instead, Hawk and Spenser concoct a plan to destroy the Ukranian mob, and set up Luther's surviving child financially. Spenser finds himself in a minor moral delimma, since he usually only kills people in self-defense. So there's a lot of chit-chat about that.
Summary: short on action, short on detecting. Not the best outing.