Jake Cogburn, code name Hondo, is the deadliest agent in the CIA's secret enhancement program. Designed to be the perfect killing machine, he's the program's greatest asset, and biggest secret, until the night he removes his tracker and disappears. Once he goes rogue, his handler and only friend, Mike Grant, has a big decision to make; hunt him down or delete all the information in his file, including his last known whereabouts.

Mike has always sensed there's something more to Jake than a mindless killer. He feels drawn to the secret assassin in a way he can't describe, and even though he's sworn an oath to his country, he feels his first loyalty is to his secret agent. Knowing there will be severe consequences, he does the best he can to assist Jake after he disappears, going rogue himself in order to help Jake get a head start.

But once he helps Jake, who will help him avoid the consequences of a rogue heart?