East Berlin, 1975: When Oberleutnant Karin Müller is called to investigate a girl's body at the foot of the Wall, she realises this is a death like no other. It seems the girl was trying to escape - but from the West. The Stasi want her to discover the identity of the girl, but assure Müller the case is otherwise closed. This is not a regime that tolerates a curious mind, and Müller doesn't realise that the trail she's following will lead her dangerously close to home…