As the Cold War rages in the full glare of the world media, the Underground War is fought in ruined bunkers, dank tunnels, building sites, and bombed out apartment blocks.
In the divided city of Berlin, the Reserve Police Agency hunts down monsters left over from sinister experiments and twisted technology. Things from beyond our space and time, strange creatures altered by bizarre machines, the decayed corpses of undead soldiers, things that hide in the darkness.
But the Reserve Police Agency itself is riven by suspicion, mistrust and political ambition. The four occupying powers of Britain, France, the USA and the USSR all see the need for the RPA, all contribute personnel, all have their own agendas.