The young law student Aylin knows exactly what she wants: Become a lawyer. To finance her studies, she works as an escort girl. Because she had to defend herself against a pushy businessman, now threatened five years in prison. From the police comes an offer that she embarks on in her distress: As a decoy Aylin can avert her punishment and even continue to study law. Drug investigator Jan and his boss Hannah use them on the smuggler Musab to arrest him in the act. How dangerous the clever Clan chief can be, but they both do not say.

After the success of the first film "Die Informantin", which delighted over 5.5 million viewers, the story of the undercover law student Aylin is now being told. She actually doesn't want anything to do with the LKA. But she has no choice. In "Der Fall Lissabon" she has to spy on a star lawyer who launders money for terrorist cells. Should she refuse, the life of her sister and that of her niece is threatened. Crime scene inspector Aylin Tezel embodies a brave young woman who gets caught between the fronts and can only rely on her instinct.