The Looking Glass War (George Smiley Series #4)

An experienced agent is mysteriously killed on a freezing night near a foreign airport. Thus begins an intricate mission of military espionage that brings together three desperate men.
The zealot, the pawn, the string puller: each seeks a different kind of glory, each risks the thing he values most, each is caught up in a double-sided game that carries him from London to Berlin — and from treachery, to betrayal, to cold-blooded murder.
"Le Carre is simply the world's greatest fictional spymas...