Shinobi Mystery Series by Susan Spann

May 1564: When a samurai is brutally murdered in a Kyoto teahouse, master ninja Hiro has no desire to get involved. But the beautiful entertainer accused of the crime enlists the help of Father Mateo, the Portuguese Jesuit Hiro is sworn to protect, leaving the master shinobi with just three days to find the killer in order to save the girl and the priest from execution... moreMay 1564: When a samurai is brutally murdered in a Kyoto teahouse, master ninja Hiro has no desire to get involved. But the beautiful entertainer accused of the crime enlists the help of Father Mateo, the Portuguese Jesuit Hiro is sworn to protect, leaving the master shinobi with just three days to find the killer in order to save the girl and the priest from execution.The investigation plunges Hiro and Father Mateo into the dangerous waters of Kyoto's floating world, where they learn that everyone from the elusive teahouse owner to the dead man's dishonored brother has a motive to keep the samurai's death a mystery. A rare murder weapon favored by ninja assassins, a female samurai warrior, and a hidden affair leave Hiro with too many suspects and far too little time. Worse, the ninja's investigation uncovers a host of secrets that threaten not only Father Mateo and the teahouse, but the very future of Japan. less

Autumn, 1565: After fleeing Kyoto, master ninja Hiro Hattori and Portuguese Jesuit Father Mateo take refuge with Hiro's ninja clan in the mountains of Iga province. But when an ambassador from the rival Koga clan is murdered during peace negotiations, Hiro and Father Mateo must find the killer in time to prevent a war between the ninja clans... moreAutumn, 1565: After fleeing Kyoto, master ninja Hiro Hattori and Portuguese Jesuit Father Mateo take refuge with Hiro's ninja clan in the mountains of Iga province. But when an ambassador from the rival Koga clan is murdered during peace negotiations, Hiro and Father Mateo must find the killer in time to prevent a war between the ninja clans.With every suspect a trained assassin, and the evidence incriminating not only Hiro's commander, the infamous ninja Hattori Hanzō, but also Hiro's mother and his former lover, the detectives must struggle to find the truth in a village where deceit is a cultivated art. As tensions rise, the killer strikes again, and Hiro finds himself forced to choose between his family and his honor. less