Aimed at readers who thrill to King, Empire and the fluttering Union Jack, as well as to brave white heroes, their faithful dusky-skinned servants and sneering villains, this alternative history supposes that in 1878 "a series of high-velocity heavenly bodies struck the earth," wreaking havoc throughout Europe and North America. Because much of the British merchant fleet survived the "Fall," the English upper classes were able to escape to the Asian subcontinent. As a result, the British raj, extending from Delhi through India, Afghanistan and the Kashmir, still exists in the 21st century, though the technology consists of 19th-century vintage railways, hydrogen airships and a turbine-powered building-sized "Engine," the equivalent of a computer. It's a nifty premise, but in trying to continue in the grand tradition of such adventure writers as Kipling, Lamb and Mundy, whom Stirling acknowledges as influences, the author fails to inject much life into his stock characters, from the heroic Captain Athelstane King of the Lancers and the captain's memsahib sister, Cassandra, to King's Sikh companion, his trusty Muslim servant and the inevitable wise and helpful Jew. Not without humour, appendices survey the worldwide consequences of the Fall, complete with the succession of British monarchs from Victoria on.