A Colder War by Charles Cumming

A classic old-school espionage novel, with some intriguing plot twists.  Tom Kell, an out of favor British agent is sent to investigate the suspicious death of another British agent in Turkey.  Kell is tasked with searching out a potential mole in the British or American services in Turkey - and the plot begins its twists and turns.  Cumming is great at bringing us into the world of spies, where nothing can be accepted on its face.  382 pages