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A Japanese serial killer terrorizes New York, opposed only by a karate-savvy cop In the dojo, Manny Decker learned that training, focus, and cold discipline could make a man more dangerous than any weapon. His skill with his fists was useful in the US Marines, and served him even better afterwards, as a cop walking a tough New York beat. Since he became a detective, Decker hasn't found much use for his hand-to-hand skills, but his mental toughness has proved invaluable as he navigates the narrow line of an Internal Affairs investigator. Keeping an eye on other cops, he has found, means risking his life inside and outside the precinct house. Decker also knows that a mastery of karate can be used for evil as well as good. Investigating a corrupt security company, Decker finds himself on the trail of a psychopathic killer who can snap a windpipe with one chop of his palm. Only karate can stop him, and when the final confrontation occurs, karate is all Decker will have.