Former Pinkerton spy Isabelle Webb and her friends decide to join up with Isabelle's fromer guardian Genevieve Montgomery upon discovering that she is funding an expedition to a burial site near Luxor with an entourage of Egyptology experts. At the excavation site--a cave rumored to be the tomb of a pharaoh's disgraced daughter--tension builds when several newcomers arrive and Isabelle finds that some of the royal treasure in the ruthless pharaoh's desert was buried for lethal reasons.