This incredible true story takes place in Berlin, 1961. Germany is a country divided. Harry Melchior has narrowly escaped the communist regime of East Berlin and now in the West is determined to free his sister who was not so lucky. Joined by others also desperate to free their loved ones, they have an audacious plan: to tunnel beneath the wall and the 'death strip' patrolled by border guards. But not everyone can be trusted and they are soon digging for their lives in a nerve-racking race against time.