Three brutal murders, three high-profile victims, three bodies marked with a mysterious and archaic symbol...The massive SIGMA Force thriller from the NEW YORK TIMES bestselling author of MAP OF BONES and THE LAST ORACLE. At Princeton University, a famed geneticist dies inside a biohazard lab.In Rome, a Vatican archaeologist is found dead in the heart of St Peter's Basilica.In Africa, a US Senator's son is slain within a Red Cross camp in Ghana.These three murders on three continents bear a horrifying tie: all the victims are marked by a Druidic pagan cross burned into their flesh.The bizarre murders thrust Commander Gray Pierce and SIGMA Force into a global hunt for a powerful group of industrialists who have a stranglehold on the world's food supply.Aided by two women from his past, Gray flees a trio of high-tech assassins as he pieces together the clues.But saving the world comes at a price: Pierce must sacrifice one of the women.Yet even that price might not be enough, for, as he soon discovers, the only true path to salvation lies with the Doomsday Key.