A highly skilled martial artist is recruited by British intelligence to participate in a clandestine mission under the guise of taking part in a highly competitive kung fu tournament. The tournament is held on the private island of a reclusive crime lord, who is suspected of involvement in opium trafficking and prostitution. The martial artist's personal motivation intertwines with his assignment, as he seeks to avenge the death of his sister, who had fallen victim to the crime lord's criminal activities. He travels to the island with a vivid awareness of the double mission ahead – to win the tournament and to gather intelligence on the criminal activities being orchestrated from within the island's secretive confines.

The tournament attracts fighters from all over the world, each skilled in different martial arts disciplines, weeding out the weak and showcasing the power and strategy of true martial arts mastery. Amidst the intense battles, the martial artist must navigate treacherous encounters, discovering allies in fellow competitors—a playboy-gambler, and an Afro-American fighting for his own personal reasons. Their unique skills complement one another as they begin to unravel the mysteries of the fortified estate. Dangerous challenges lurk at every turn, and the heady mix of competition and subterfuge pushes the martial artist to the limits of his physical and mental prowess, all while the ever-watchful eyes of the crime lord monitor their every move.