2008: Deep in the mountain forests of Wyoming, Julian Cooke stumbles across the rotting remains of a wooden wagon. He's discovered what's left of a convoy of settlers that vanished in the winter of 1856. It's clear that something horrific happened here all those years ago. 1856 Miles from any kind of civilisation, a wagon train is forced by heavy snow to circle the wagons. The group of Native Americans also trapped nearby as their greatest threat. But they soon realise what true danger is...