A mysterious manuscript purporting to prove the Soviet defense system is unworkable is smuggled out of Moscow. It was intended for a flaky English publisher, a womanizing saxophone-playing boozer, but the smuggler has turned it over to British intelligence. In order to prove its authenticity, they recruit the publisher as an amateur spy and send him to Moscow to reestablish contact with the author. But the "truth" Barley Blair finds there is love and a purpose for his shambles of a life.
As always with Le Carré, this is a compelling spy story, a marvelous entertainment that is also as intelligent, witty, and brooding as many more self-consciously and less satisfying literary novels. It may not be the equal of The Quest for Karla trilogy or of a A Perfect Spy but it bears all the marks of a master, of the man who has both redefined and reanimated the espionage genre.