"Detective Alex Cross hunts down a serial killer who targets entire families--and who will next be coming for the Crosses. A precise killer, he always moves under the cover of darkness, flawlessly triggering no alarms, leaving no physical evidence. Cross and Sampson aren't the only ones investigating. Also in on this most intriguing case is the world's bestselling true-crime author, who sees patterns everyone else misses. The writer, Thomas Tull,...