A review by embi
The Secret War: Spies, Codes and Guerrillas 1939–1945 by Max Hastings

4.0

Incredibly comprehensive and detailed, although strongly focussed on the European theatre.
Hastings also references the British/German double cross agents repeatedly as an important source of disinformation, but never actually discusses the scheme in any detail. It does not appear to be because he has written on it elsewhere