Casey Bowman has finally settled down. He's happily married to Namiko (who is pregnant with their first child), living in Japan and teaching at the Koga dojo. While buying her a present, Casey is attacked by two punks. He shrugs it off, assuming it to be a simple mugging. But when Namiko is brutally murdered later that same night, Casey's world falls apart. Stricken with grief and thirsty for revenge, Casey tracks down the two thugs who tried to rob him, but they can't provide him with any clues to his wife's murder. So Casey travels to Thailand, to the dojo of a close friend. His grief and anger are taking control of him and he lashes out while sparring with other students. When one of the students is killed in the same way as Namiko, Casey finally gets the clues he needs to track down his wife's killer and unravel a mystery of grudges deep in the Burmese jungle.