Sophie, daughter of the designated LKA president Herbert Wichert, disappears without a trace from an elite boarding school. LKA investigator Isabell Moosbach goes undercover as a sports teacher. Then a pupil is found shot dead. During her investigations, Isabell Moosbach, who is infiltrated by the LKA under the pseudonym Karla Parker, discovers former GDR connections that go back to the police murders at Runway West in 1987.