• Extraordinary . . . a remarkably faithful account

    Guardian on The Secret Life of Bletchley Park
  • Painstakingly researched and fascinating

    John Harding, Daily Mail on The Secret Listeners
  • Lucid, well-researched and rich in detail

    John Preston, Daily Mail on The Spies of Winter
  • Fascinating, riveting, unsettling, and wonderfully rich in period detail

    Craig Brown, Mail on Sunday on Mile End Murder