City of Gold — Len Deighton

January 1942. Rommel's seemingly invincible Afrika Korps is at the gates of Egypt â€" perhaps soon to threaten Cairo itself.
And Rommel has a spy in the city â€" a source so well-informed that the German commander knows in advance every movement of the allied forces.
Amongst the teeming streets and bazaars, the British, led by Major Albert Cutler, must find him. But Cairo is a city of fool's gold, where nothing and nobody, not even Cutler, can be taken at face value.