A British archaeologist—a member of an expedition gone missing for over two years—stumbles out of the Egyptian desert. Before he can explain what happened to his team, he dies. But his remains hold a terrifying discovery that only deepens the mystery: something had begun mummifying his body while he was still alive.

Summoned by a former ally at the British Museum, Commander Grayson Pierce of Sigma Force must uncover the truth behind the brutal murder and discover the fate of the missing team. The first clues are tied to a shocking historical mystery, one connecting the travels of Mark Twain, the genius of Nikola Tesla, and the journeys of famous explorer, Henry Morgan Stanley. The frantic hunt for the truth will take Sigma Force from an ancient tomb buried under the burning sands of Egypt to a modern engineering complex built atop the frozen fields of the Arctic.

As a looming crisis grows, Gray Pierce and his allies must confront a threat born of t