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Spy-Masters, Nazis and secrets.

It's the Second World War, and Sexton Blake is matching minds with the very best...and the very worst.

When an innocent woman is condemned as a spy and her fiancé arrested while trying to escape to France, Sexton and Tinker have to travel into enemy territory in their hunt for the mastermind....and on the home front, a man is found murdered - but the suspect doesn't know if he did it! Who else to find the truth but Sexton Blake?

Join the greatest detective as he battles with a mysterious house, a ring of traitors - and a deadly secret.