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One night, in the Los Angeles' Little Tokyo neighborhood, a stripper named Sugar Torch is shot and killed. While examining the Japanese art that adorns the dancer's dressing room, homicide detectives Charlie Bancroft and Joe Kojaku learn that she had been developing a new act. In the narrative paintings, Sugar is dressed as a geisha, and she and her Japanese lover are killed onstage by a jealous karate expert. Joe, who knows everyone in Little Tokyo, questions local kendo and karate practitioners about the identity of the male characters in the new act, while Charlie seeks out Christine Downes, the artist who painted the portrait of Sugar in her kimono. Back at the apartment they share, Joe confesses to Charlie that because his girl friend was reared in Japan and he in the United States, they argue about the "old country" constantly. Later Charlie questions Chris, an art student at the University of Southern California, about the man who commissioned Sugar's portrait, Mr. Hansel. As Chris sketches Hansel's portrait, Charlie flirts with her, and she smiles. Joe discovers from two nuns that a formidable Korean man named Shuto, who was to be the karate expert in the striptease act, knows his old friend, Mr. Yoshinaga. Joe finds the kindly Yoshinaga in the local Buddhist temple, where he has come to observe the anniversary of his son's death. After the private ceremony, he leads Joe through Little Tokyo to the Koga Rice Cake Co. Shuto, who works at the factory, panics when he sees the detective, and Joe loses sight of him during the ensuing chase. Charlie's friend Mac, an eccentric but endearing artist who lives on Skid Row, worries that because Chris's sketch of Hansel has now been broadcast on television, the criminal might try to kill her. As feared, someone takes a shot at Chris that night. For her protection, she moves in with Charlie and Joe, and when fear causes her to burst into tears, Charlie kisses her. Later, Charlie and Joe visit Roma, a wigmaker, who knows Hansel, but she provides little information. They then learn that Hansel has just left his position as an Asian specialist at the public library, where he was known by his real name, Paul Sand. That evening, Joe and Chris realize while talking together that they are deeply in love. Afraid of hurting Charlie, Joe resolves to hide his feelings from his friend, but becomes sullen and uncommunicative. Worried by Joe's moodiness, Charlie fears that Chris may have inadvertently expressed prejudice toward Joe, and this concern causes Chris to realize the depth of the men's friendship. Joe and Charlie face off in the Nisei Week kendo demonstration, and Joe surprises everyone by attacking his friend mercilessly. Later, Joe confesses his love for Chris. When Charlie looks up and gravely asks Joe if he intends to marry Chris, Joe assumes that his friend's anger is based on racism and is devasted. After expressing his confusion to Chris, Joe packs his bags, resigns from the force, and prepares to leave town. Chris and Charlie try to persuade him that neither of them feels anything but love for him, but Joe cannot believe this. As Chris is speaking, she suddenly sees Hansel. When Charlie and Joe corner him, Hansel claims that as an Asian specialist, he only meant to advise Sugar Torch on her act. When they ask Hansel why he shot the stripper, Roma appears and takes a shot at Charlie. Joe pursues her through the Nisei Week parade and is finally forced to shoot her. As they await the ambulance, the distressed woman admits it was she who killed Sugar. Having assumed that Hansel preferred the stripper to her, the wigmaker killed her rival, but later realized there was nothing between the two. Joe takes this in and immediately turns and apologizes to Charlie. As the friends reconcile, Chris runs into Joe's arms and they kiss.