He Shall Thunder in the Sky
Barbara Mertz
 The novel takes place in 1914, as Ramses Emerson works undercover to gather intelligence for the British military, Nefret returns from studying medicine in Switzerland, and Percy Peabody returns to wreak revenge on the Emerson family for past events. The Emerson have acquired the firman for part of the Giza concession, but of course are distracted by the criminal element, and eventually by a startling revelation from the Master Criminal, Sethos himself.