When Hammer finds one of his friends murdered, he vows to find the killer and punish him, no matter what the cost He begins by questioning all the guests of a recent party held by the late Jack Williams There's Myrna, Jack's girlfriend and ex-heroin addict George Kalecki, a wealthy man with a crooked past Hal Kines, a handsome, athletic, college type the Bellamy twins, a couple of gorgeous, rich sisters and finally, Charlotte Manning, a breathtakingly beautiful and successful Park Avenue psychiatrist