"The dramatic story of the remarkable British spymaster...Many spy stories are page-turners, but [Henry Hemming] proves that the story of one man can be equally thrilling. Hemming has uncovered a man determined not to be known and in so doing, has provided us with delightful reading."
"Espionage writing at its best."
-Charles Cumming, author of A Divided Spy
"Crammed with cracking stories and founded on sound research, Henry Hemming's biography of Maxwell Knight-'M'-stands comparison with the bestselling books of Ben Macintyre."
-Adam Sisman, author of John Le Carré
"I raced through Henry Hemming's book, constantly having to remind myself that it wasn't a work of fiction. It really has everything you'd want from a great espionage story: incredible agents risking their lives; the highest possible stakes, with the safety of the world hanging in the balance; and at its heart a complicated, mercurial spy master in Maxwell Knight spinning an ever more intricate web."
-Matt Charman, Oscar-nominated screenwriter of Bridge of Spies
"Absolute proof that assiduous digging in the archives can produce scoops. This is intelligence research at its best, especially in the identification of hitherto anonymous agents. Definitely a great contribution to the literature."
- Nigel West, author of MI5
"This in-depth introduction illuminates a largely forgotten man of antidemocratic tendencies who played a key role in keeping Britain secure and democratic for much of the interwar and early postwar periods."—Publishers Weekly