Blade of the samurai

the long version

"Master ninja Hiro Hattori is trying to sleep when he has an unexpected visit from his friend Kazu, a fellow shinobi and member of the same ninja clan working undercover at the shogunate. Kazu says that Saburo, the Shogun's cousin, has been stabbed to death within the walls of the Shogun's palace with Kazu's dagger, and that though he is innocent, he fears he will be blamed for the murder. He begs Hiro's help in escaping the city. But before he can flee, Hiro and Father Mateo, the Jesuit priest under Hiro's protection, are summoned to the palace to aid in the investigation"--