Baffin Island: Sam and Remi Fargo are on a climate-control expedition in the Arctic, when they discover a Viking ship in the ice, perfectly preserved - and filled with pre-Columbian artefacts from Mexico. How can that be? As they research, clues about a link between the Vikings and the legendary Toltec, feathered serpent-god Quetzalcoatl and a fabled object known as the Eye of Heaven soon emerge. And the Fargos find themselves on the run from treasure hunters, crime cartels, and those with far more personal motivations for stopping them from unearthing the solution to a thousand-year-old mystery . . .