Olden, Marc. Black Samurai series #8th

For the sake of his master's memory, Sand will kill to recover a magnificent sword. Though useless in battle, the emperor's katana is a beautiful weapon. Cast from solid gold, this 1,200-year-old blade was thought to be lost until Master Konuma, teacher of samurais, presents it as a gift to the people of Japan. Soon after, he is savagely murdered, leaving his American student, Robert Sand, to avenge his death. The sensei is gone, but the sword remains as a symbol of his generosity, until the day the katana vanishes. A madman snatches the treasure from the Metropolitan Museum, wanting the katana at his side as he makes a bid for world domination. Now it's Sand's turn to steal it back, and destroy the monster who dishonored his sensei's memory. The katana is too valuable to use in a fight, but for its sake much blood will flow

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