Rules of Prey (Lucas Davenport Mysteries) (1989)

Louis "Maddog" Vullion is a young attorney . . . and a murderer. He kills for the sheer contest, playing an elaborate game for which he has written terrifying rules. Police Lt. Lucas Davenport, a brilliant games inventor, is going to have to outmaneuver the killer's clever plan--to beat the mad dog at his own deadly craft.