The book was first printed in 1889.
The story is set in the Ptolemaic era of Ancient Egyptian history and revolves around the survival of a dynasty bloodline protected by the Priesthood of Isis. The main character Harmachis (the living descendant of the pharaoh's bloodline) is charged by the Priesthood to overthrow the supposed impostor Cleopatra, drive out the Greeks and Romans and restore Egypt to its golden era.