A murder nobody could possibly commit. A terrorist plot to unleash nuclear war. And a dark, Soviet - era secret buried so deep its only trace is one word . . . Cosmonaut. Aboard the orbiting International Space Station, alone on the rim of space, troubled ex - astronaut turned homicide cop 'Edge' Reynolds must fight a desperate losing battle. Someone on board is a murderer. Someone on board is planning to destroy the station. Someone on board is hiding a secret so incredible its keepers would do anything to stop it being exposed. Edge must find out who they are. He has to stop them, and make it back to Earth. Alive. He has to warn NASA, and the world, of the incredible secret of Cosmonaut. Before it destroy us all.