Max Keller (Timothy Van Patten) meets John Peter McAllister (Lee Van Cleef), a Korean War veteran who remained in Japan after the war, eventually joining and training in a ninja sect. McAllister is searching for his daughter, whom he hadn't known existed, and the two set out together with Keller helping in the search in exchange for McAllister training him in the ways of the ninja. Following McAllister from Japan is his former student who has been assigned the task of killing his former teacher for leaving the ninja sect. While traveling the country, Keller and McAllister aid a father and daughter who own an airfield that a greedy land developer want to get his hands on.