The latest pulse-pounding thriller from New York Times bestsellers Preston & Child

Fifteen years ago, a group of young engineers took a winter mountaineering trip to the New Mexico mountains. When they failed to return home, searchers uncovered a disturbing scene. The group's tent had been slashed open from the inside, as if its inhabitants had fled in terror. What could have been horrific enough to make nine adults risk their lives in a vicious blizzard?

Despite a diligent FBI investigation, and the