SINCLAIR MCKAY is the acclaimed author of history and historical true crime including the best-selling The Secret Life of Bletchley Park. HIs previous Aurum titles include Mile End Murder, The Lost World of Bletchley Park, The Secret Life of Fighter Command and The Secret Listeners for Aurum, as well as histories of Hammer films and the James Bond films. He writes features for the Daily Telegraph and the Mail on Sunday and lives in London.

'As McKay argues in this well-told story, the Y Service has been "sadly and curiously" uncelebrated. Yet were it not for all those encoded messages relayed with such care, the codebreakers at Bletchley would have had little to go on. It was their efforts that made the revolutionary leaps of Bletchley possible. They should be commemorated properly as having played their parts in one of the greatest achievements of the 20th century, he says. And he has done them proud.'

SINCLAIR MCKAY is the acclaimed author of history and historical true crime including the best-selling The Secret Life of Bletchley Park. HIs previous Aurum titles include Mile End Murder, The Lost World of Bletchley Park, The Secret Life of Fighter Command and The Secret Listeners for Aurum, as well as histories of Hammer films and the James Bond films. He writes features for the Daily Telegraph and the Mail on Sunday and lives in London.

'As McKay argues in this well-told story, the Y Service has been "sadly and curiously" uncelebrated. Yet were it not for all those encoded messages relayed with such care, the codebreakers at Bletchley would have had little to go on. It was their efforts that made the revolutionary leaps of Bletchley possible. They should be commemorated properly as having played their parts in one of the greatest achievements of the 20th century, he says. And he has done them proud.'