A Colder War by Charles Cummings
Thomas Kell is a disgraced agent who longs to come in from the cold. When MI 6’s top spy in Turkey is killed in a mysterious plane crash, his chance arrives…for Kell is the only man Service Chief Amelia Levene can trust to investigate the accident. In Istanbul, Kell soon discovers that that there is a traitor inside Western Intelligence. Then he meets Rachel – the dead spy’s daughter – and the stakes grow higher still.
From London to Greece and into Eastern Europe, Kell tracks the mole. But a betrayal close to home transforms the operation into something more personal. Soon Kell will stop at nothing to see it through.