aIn a breathtaking blend of scientific intrigue and historical mystery, #1 New York TimesAre those plagues starting again?Before Director Crowe can investigate, a mysterious group of assassins leaves behind a fiery wake of destruction and death, erasing all evidence. With the professor's body incinerated, his home firebombed, Sigma Force must turn to the archaeologist's only daughter, Jane McCabe, for help. While sifting through what's left of her father's work, she discovers a puzzling connection tying the current threat to a shocking historical mystery, one involving the travels of Mark Twain, the genius of Nikola Tesla, and the adventures of famous explorer Henry Morgan Stanley. To unravel a secret going back millennia, Director Crowe and Commander Grayson Pierce will be thrust to opposite sides of the globe. One will search for the truth, traveling from the plague-ridden streets of Cairo to a vast ancient tomb buried under the burning sands of the Sudan; the other will struggle to stop a mad genius locked within a remote Arctic engineering complex, risking the lives of all those he holds dear. As the global crisis grows ever larger, Sigma Force will confront a threat born of the ancient past and made real by the latest science₇a danger that will unleash a cascading series of plagues, culminating in a scourge that could kill all of the world's children . . . decimating humankind forever.