He Shall Thunder in the Sky

I liked this book written by Elizabeth Peters. In 1914, Ramses Emerson works undercover to gather intelligence for the British military, at the start of World War I. Nefret returns after recovering in a hospital in Switzerland, and explains her strange behavior. Percy Peabody plans to seek revenge on the Emerson family. The family is also confronted by their long time nemesis, the Master Criminal Sethos.

This is the 12th novel in the series. The title comes from a translation of The Judging of Horus and Set from a papyrus. The novel's climax coincides with the First Suez Offensive, the attack launched by the Ottoman Empire on the Suez Canal in January 1915.