When Julia Grosz' friend Ela, who infiltrated the left-wing autonomist scene in Hamburg as an undercover investigator for the LKA, disappears without a trace, Grosz goes in search of her. Under a false identity, she enters the hedonistic, liberal milieu in which her friend seems to have lost herself. Falke supports Grosz - and at the same time investigates in the case of an arson attack, which initially resulted in aseries of politically motivated acts of violence seems to follow. But when the boundaries become increasingly blurred for Grosz and Falke encounters questionable internal police information, both stumble. Only when both investigators pull together can they identify the person responsible for the arson attack, who is also involved in Ela's disappearance - and is much closer to her than initially suspected.