In 1932 a French spymaster photographs the operating instructions of the cipher machine, Enigma. A few weeks later a mathematician in Warsaw begins to decipher the coded communications of the Third Reich and lays the foundations for the code-breaking operation at Bletchley Park. Ten years later, the code-breakers have risked their lives to continue their work and are on the ruin from the Gestapo. Based on original research and newly released documents, X, Y & Z is the exhilarating story of those who risked their lives to protect the greatest secret of WW2 written by Dermot Turing, the nephew Alan Turing.