Someone's got Terry McCaleb's number. A veteran FBI profiler, McCaleb is unrelenting in his pursuit of justice and unequalled in his success at tracking and catching murderers. But as he closes his latest adversary--a psychopath dubbed "The Code Killer" by the media--McCaleb is felled by a massive heart attack and forced into early retirement. Two years later, a beautiful stranger reveals a secret that compels McCaleb to re-examine his recovery: his life was saved by someone else's death--the victim of a murder that remained unsolved. Against the advice of his cardiologist, and with the help of an eager neighbor, McCaleb literally puts his life on the line to track down a murderer who has forced him to take this case personally. He's a heartbeat away from catching the killer.