Attorney Ingo Lenssen and his team of investigators who specialize in sensitive cases involving clients who prefer private investigations to legal advice.

A long-running German television series about a two-man team of highway police, originally set in Berlin and later in North Rhine-Westphalia.

Ingo Lenssen takes on a dubious organ dealer aftern nine-year-old “Mücke”, the son of former colleague Tekin Kurtuluş and Lenssen's godchild, is hit by a car and his life is in danger. As Tekin threatens the driver of the car with retaliation and he is injured in an attack shortly afterwards, the ex-investigator comes under suspicion. In order to exonerate their former colleague, Ingo Lenßen and his colleagues begin an unauthorized investigation.