John Thinnes, a detective on the Chicago police force, and Jack Caleb, a well-known psychiatrist, were friends---unlikely friends, maybe, with very different lives, but men who liked and respected each other. And they had one significant experience in common: Both had been "in country" in Vietnam during the war. Their "labels" were different---Thinnes had been in the military police, Caleb a medic, a conscientious objector who chose to fight with...