Ashton-Kirk, who has solved so many mysteries, is himself something of a problem even to those who know him best. Although young, wealthy, and of high social position, he is nevertheless an indefatigable worker in his chosen field. He smiles when men call him a detective. "No; only an investigator," he says.He has never courted notoriety; indeed, his life has been more or less secluded. However, let a man do remarkable work in any line and, as Emerson has observed, "the world will make a beaten path to his door...