Giri the Japanese Call It — Marc Olden

Giri: Japanese for loyalty. For one American it comes to mean something else, something infinitely more lethal. A crazed mass murderer is terrorizing New York, his victims the target of a strange and deadly form of Oriental blood sacrifice. Detective Sergeant Decker, a cop with a potent understanding of the martial arts, is put on the killer's trail. At once he is enmeshed in a network of betrayal and murderous deception that stretches from Saigon's serpentine alleyways to Manhattan's diamond markets to the vast, seething underworld of Paris. His only hope for survival lies in the arms of an exotic Japanese beauty - a woman for whom the twin arts of death and desire are endlessly entwined. A woman with a desperate, burning passion for Giri that leads Decker into an ancient quest for vengeance as razor-sharp as a Samurai's sword.