From New York Times bestselling author of The Judas Strain and Map of Bones comes a new story of the SIGMA Force to battle a group of rogue scientists who've unleashed a bioengineering project that could bring about the extinction of mankind. As ruthless hunters search for a stolen coin that traces back to the Greek Oracle of Delphi, Commander Gray Pierce discovers that the coin is the key to unlocking a plot that dates back to the Cold War, one that threatens the very foundation of humanity.