A young Dutch baroness and her scientist husband hold a secret.It could lead Nazi Germany into developing atomic weapons, capable of annihilating London,New York and Moscow.Having already escaped from Franco's Spain in 1936, they are forced to flee from Belgium by the invading German army in 1940.Hunted across France, the Pyrénées and Spain, they must survive and trust no one. Pursuing them on behalf of the Third Reich is the Baroness' childhood neighbour, now a high-ranking SS Officer, followed closely behind by British Military Intelligence.