When Denton hears there's a fellow missing from Oxford, it takes him a while to grasp that "fellow," in this instance, means some sort of academic character, and not, you know, a fellow. A bloke. Never mind: He's very happy to set off for Oxford and a spate of poking around. It will be a holiday, a peaceful sojourn, he imagines, among the hushed libraries and the famous dreaming spires. It will be so different from frantic, filthy London,...