The Lost Army of Cambyses by Paul Sussman
"In 523 B.C. the Persian emperor Cambyses dispatched an army across Egypt's western desert to destroy the oracle of Amun at Siwa. Legend has it that somewhere in the middle of the Great Sand Sea his army was overwhelmed by a sandstorm and destroyed. Five thousand men were lost." "Two and a half thousand years later, a mutilated corpse is washed up on the banks of the Nile at Luxor, an antiques dealer is savagely murdered in Cairo, and an eminent British archaeologist is found dead at the ancient necropolis of Saqqara." "At first, the incidents appear unconnected. Inspector Yusuf Khalifa of the Luxor police is suspicious, however. And so too is the archaeologist's daughter, Tara Mullray. As each seeks to uncover the truth, they find themselves thrown together in a desperate race for survival.