In early 1900, the paths of three British writers--Rudyard Kipling, Mary Kingsley and Arthur Conan Doyle--crossed in South Africa, during what has become known as Britain's last imperial war. Each of the three had pressing personal reasons to leave England behind, but they were also motivated by notions of duty, service, patriotism and, in Kipling's case, jingoism. Sarah LeFanu compellingly opens an unexplored chapter of these writers' lives,...