In James Rollins's scintillating sixth Sigma Force novel, the team must somehow unravel a diabolic triple homicide, burdened by the fact that the murders take place on three different continents. Commander Grayson Pierce and his crew soon discover a secret code attached to a mummified corpse, which in turn unveils the "Doomsday Key," an ancient medicinal substance which could easily eradicate humanity from existence. The Sigma members split up to scour the globe for this mysterious lethal material, never suspecting that one of their own is harboring traitorous intentions.

The best-selling author of The Last Oracle and The Judas Strain presents a latest work in which the Sigma Force must solve a centuries-old secret involving coded prophecies about dark events leading to a future apocalypse. 350,000 first printing.

The best-selling author of The Last Oracle and The Judas Strain presents a latest work in which the Sigma Force must solve a centuries-old secret involving coded prophecies about dark events leading to a future apocalypse. 350,000 first printing.