FLAMBEAU, once the most famous criminal in France and later a very private detective in England, had long retired from both professions. Some say a career of crime had left him with too many scruples for a career of detection. Anyhow, after a life of romantic escapes and tricks of evasion, he had ended at what some might consider an appropriate address: in a castle in Spain. The castle, however, was solid though relatively small; and the black vineyard and green stripes of kitchen garden covered a respectable square on the brown hillside. For Flambeau, after all his violent adventures, still possessed what is possessed by so many Latins, what is absent (for instance) in so many Americans, the energy to retire. It can be seen in many a large hotelproprietor whose one ambition is to be a small peasant.