Thomas Helmholz is a modest doctor and family man in the former East Germany. So why does he have to find proof that, until now, the Cold War has kept on ice the most sinister secret the Second World War has yet to give up? Hunted and blackmailed by agents of a foreign power, Helmholz alone knows that the world has not heard the last of Nazi eugenics, and that the worst shock is still to come. For if Crick and Watson were not the first to discover DNA, how far behind are the rest of us?