The rich businessman Stefan Kühn is sent to a bank as a living bomb by three gangsters to demand three million. Freddy Schenk, who happens to be a witness to the unusual bank robbery, calls his colleague Max Ballauf, who alerts the SEK. The bank robbers escape and leave a dead body. Ballauf and Schenk take up the investigation, which initially leads nowhere. The gangsters seem to be shadowless. But then Max notices a small but important clue that prompts him to research in a completely different direction.