#1 New York Times bestselling author Dean Koontz gives a new meaning to “blood brothers” in this chilling novel of friendship gone awry…No one could understand why Colin and Roy were best friends. Colin was so shy; Roy was so popular. Colin was nervous around girls; Roy was a ladies’ man. Colin was fascinated by Roy—and Roy was fascinated by death. Then one day Roy asked his timid friend: “You ever killed anything?” And from that moment on, the two were bound together in a game too terrifying to imagine…and too irresistible to stop.