During a sailing holiday on the island Rügen, the two children of Anja and Frank Mendt were abducted. Soon Frank’s father, who is living in Binz, barges in the investigations of the LKA (State office of Criminal Investigation) and its superintendent Werner Kempin. Herbert Winter used to work for the Stasi and failed in his private life. But now he is sure of recognizing a serial offender he haunted in times of DDR.