The killer raises a 9mm and calmly squeezes off five rounds. The victim slumps to the street, dead before he hits the ground. Five rounds to the chest. Not four. And not six. The anonymous predator then fades into the night leaving behind a cooling corpse. With no witnesses, the local police are stymied, opening the door for the Federal Bureau of Investigation. Agent Jacob Silva and his task force are soon on the trail of a serial killer in a race against time, a race to catch Killer Five before he strikes again.