When Prince Vain got his shirt fixed, he proclaims that he had slain two lizards in front of the tailor's house - "two in one strike". When the tailor swats seven flies at once, he sows himself a banner saying "seven in one strike", and together with his bird he starts a journey into the world to pronounce his deed.

After Jochen saves police officer Erich's life, the two men become close friends and Erich helps Jochen get a job working for Berlin's local train system. But Jochen falls into the hands of the beautiful West Berlin agent Ellen, who convinces him to participate in acts of sabotage against the trains. All of a sudden, Jochen is making a lot more money and even Erich's former girlfriend Inge becomes interested in him. But everything begins to unravel when Erich observes his friend's illegal activity on one of his nightly rounds.