Following the success of Tinker, Tailor, Soldier, Spy and increased 'spy fever', Traitor: British Double Agents covers in detail all the spies known to have acted against Britain from the 1930s to the 1980s.

John Frayn Turner reveals the infamous Cambridge spy network, made up of well-known names including Burgess, Maclean, Philby and Blunt, studies the Microdots Case in detail, and lists the atomic secret spies.

He also analyses the downfall of master spy Blake and his subsequent escape while serving a 42-year sentence and details others who sold Britain's secrets.