High stakes and desperate men

The Thirty-Nine Steps by John Buchan Operation Cicero by L.C. Moyzisch From Russia, With Love by Ian Fleming I, Benedic Arnold: The Anatomy of Treason by Cornel Lengyel Background to Danger by Eric Ambler Klaus Fuchs, from The Traitors by Alan Moorehead The Spy Who Came in from the Cold by John leCarré