The First Rule By Robert Crais

When Frank Meyer and his family are executed in their home, the police begin investigating the secret life they’re sure Meyer had. Joe Pike’s on a hunt of his own: to clear his friend’s name, and to punish the people who murdered him. What starts out as a simple trail gets twisted fast by old grudges, double crosses, blood vengeance, and a crime so terrible even Pike and his partner Elvis Cole have no way to measure it.