A living mummy, Egyptian plagues, and an ancient secret in the desert sands: the Sigma Force faces its greatest challenge yet. Harold McCabe was a renowned archaeologist until he died under mysterious circumstances. McCabe was researching the ten biblical plagues, and since his death, evidence has been mounting that history is repeating itself. But before Painter Crowe, the director of Sigma Force, can investigate, a group of mysterious assassins destroys all the evidence. What did McCabe discover? And why did he highlight "The Seventh Plague" in his notes? The search for answers leads the agents of Sigma Force to the deserts of Sudan - to a pyramid buried beneath the sand...