A group of martial artists from around the world search for a book that contains the ancient secrets of how to overcome the limits of the human body.

Russian inmate Boyka, now severely hobbled by the knee injury suffered at the end of Undisputed 2. No longer the feared prison fighter he was, he has declined so far…

A story set in Indochina in 1959, a lawless land controlled by the criminal class: Vietnamese warlords and European war-criminals. Den-Dhin-Chan Labor Camp is run by four such dangerous men….