A national manhunt for the killer Kaleb Carmichael is stretching police resources to its limits. He is out there, waiting, watching - on a relentless quest for revenge. He strikes again, toying with police.

Detective Sergeant Jarrod O'Connor's world implodes following a personal tragedy. Grappling to cope with his loss, he is forced to take extreme action to protect his family.

How far will he go to keep them safe? What lines will he cross to see justice served? Carmichael reaches out with a promise and an ultimatum; seek revenge or suffer retribution. O'Connor must decide, forced with a choice - kill or be killed.