Mass pile-up on the highway. Semir examines the wrecked cars and finds a man's severed hand among the debris. The original owner can only be identified by the signet ring. This is the software expert Alexander von Rohloff. He actually works for the Japanese company "Nakamura Limited". Since André is ill, Semir is assigned the Yakuzza specialist Rebecca Herforth from the State Criminal Police Office as his partner for this case. Both are wondering whether the dead man was kidnapped and murdered. During their investigations they find out that von Rohloff stole valuable software from his company and wanted to blackmail his Japanese boss. During the investigation it turns out that his boss Toshiro Funaki has sent a group of ninjas after Rohloff and his girlfriend to solve the problem. Semir and Rebecca don't have much time left to prevent the worst.