He Shall Thunder in the Sky - Hardcover

The pursuit of knowledge must never be deterred by Man's folly. So the close of 1914 finds Amelia Peabody and her husband Radcliffe Emerson back in Egypt for another season of archaeological excavation.
Trouble is brewing in Cairo and the defiantly pacifist stance of Amelia and Emerson's headstrong son Ramses is earning the young man the derision, and much worse, of the British expatriate community. Meanwhile, the charismatic nationalist el Wardani is said to be fomenting insurrection in the ancient city. And since there is no way to stand outside the political hurricane that is suddenly threatening their lives, Amelia plunges directly into it.
When el Wardani escapes a police dragnet, thanks to the direct intervention of Amelia and Emerson, the family's stake in a perilous game is raised considerably. But it's Ramses' strange secret role in it that could truly bring ruin down upon all their heads. However, there is more than intrigue and espionage, plots and counterplots, at work here. For an artifact uncovered at a Giza dig - an exquisite sculpture found where it ought not to be - confirms Amelia's most unsettling suspicion: that the chaos consuming Cairo has masked nefarious reemergence of Amelia's villainous arch-nemesis, Sethos, the Master Criminal.