On her wedding day, Franziska discovered that her fiancé was having an affair with another woman. Now she believes that all men are pigs. Sooner or later, every man cheats on his wife, the 29-year-old is firmly convinced of this. And for good reason: as a fidelity tester, she exposes unfaithful men on behalf of suspicious wives. Her success rate is 100 percent. But then Franziska is assigned to Markus, who seems immune to her charms. Are there really any faithful men left?