It's "spy versus spy" as British Intelligence moves to ferret out a mole from its ranks. Piece by piece the story is pulled together from documents and memories. Stay carefully tuned to the storyline, the names (both given and surname), and codes or you'll be as lost as MI-6 appears to be. The opening chapter at once seems to be irrelevant, and it is not until much later that it begins to fall into place: not all at once but piecemeal, as does the rest of the story. Thus begins George Smiley's quest for a mole in the British intelligence community.