High above a ravaged Tokyo, deep within the Visitor Mother Ship, the Japanese-American anthropologist, Tomoko Jones, is being revived from suspension – to become the consort of the fearsome Fieh Chan, Visitor Commander of Tokyo.
Meanwhile, her husband, resistance fighter and ninjitsu expert Matt Jones, has stumbled on a Visitor plot to kidnap the Earth's martial arts grand masters for conversion.
All clues point to Tokyo, and Matt leads a strike force to rescue the grand masters, aided by Kenzo Sugihara, a swordmaster of dazzling gifts who saves the Americans' lives more than once.
Who is this man of mystery?
The fates of Matt, Tomoko, and the whole resistance may be tied to the true identity of... The Alien Swordmaster.