Arthur Conan Doyle is often perceived as the quintessential Englishman, patriotically devoted to the Crown and the empire's defender and apologist. But such a relegation is both limiting and simplistic. Born in Scotland to Irish Catholic parents, Doyle's heritage is complex. His paternal grandfather, John Doyle, had originally left Ireland for London in the early 19th century; his father was committed to the cause of Irish separatism; and his uncle...