East Berlin 1968: a city recovering from the horrors of World War II and where the state police, the Stasi, cultivate a climate of paranoia and fear. In a place where your closest friend or family member could be a state informer, the threat of violence is ever present and no one knows this more than damaged school teacher Sebastian Metzger. But something evil and ancient is stalking Metzger from the shadows of war-torn buildings-something which threatens the city and perhaps even the future of humanity itself.