The Doomsday Key - James Rollins

Three continents, three murders, three victims – a Princeton University geneticist, a Vatican archaeologist and a senator’s son – their bodies bearing a mysterious and horrifying tie: a Druid pagan cross burned into their flesh.

These bizarre murders lead Commander Gray Pierce and SIGMA Force into an international hunt for a powerful group with a stranglehold on the globe’s food supply. Aided by figures from his past, Pierce must piece together the clues while dodging assassins. But saving the world comes at a high price, and he soon finds himself facing a terrible decision …