George Smiley, at the request of his old wartime colleague Ailsa Brimley, investigates the murder of Stella Rode. A letter had previously come to Brimley from Rode detailing a plot supposedly by her husband, Stanley Rode, who teaches at Carne School, to kill her. Upon investigating, Smiley learns of many secrets that were kept by the victim, and one being that Terence Fielding, a house master at Carne, was being blackmailed by her due to past homosexual activities. Smiley solves the investigation when it is revealed that it was not Stanley Rode who murdered his wife, but Terence Fielding.