Peter Guillam is retired from The Circus and living peacefully on his farm in Brittany when he is summoned to London. The Circus is being sued as a result of a long-ago operation and Peter is being set up to take the fall. Guillam tells the story of Operation Windfall in flashbacks and memos. The plaintiffs are the children of the victims of Windfall, who have little memory of the parents they lost or of the Cold War they were fighting. Peter Guillam is a disciple of George Smiley, and this novel deepens the story told in “Tinker Tailor Soldier Spy” and “The Spy Who Came in From the Cold.”