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Thomas Kell is a disgraced agent who longs to come in from the cold. When MI6'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 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.

A Colder War: To catch a traitor, one spy must risk everthing . . .