A Murder of Quality (George Smiley 02) by John le Carré

A bloody and apparently senseless murder had been committed at Carne School, one of the oldest and most glittering ornaments in the British public school system. George Smiley, whose connections with Carne were complicated by sentiment, had had a curious forewarning of the crime and, in a private capacity, pursued its investigation. Without his espionage-trained insight into the workings of the human mind, Smiley might never have solved the case. But logic and insight were hardly enough to spare him the emotional aftermath of a conclusion he did not want to face.