In the grim Alaskan winter, a naturalist hunts for wolves blamed for killing a local boy, but he soon finds himself swept into a chilling mystery.

The epic story of post-Civil War America, focusing on Cullen Bohannon, a Confederate soldier who sets out to exact revenge on the Union soldiers who killed his wife. His journey takes him west to Hell on Wheels, a dangerous, raucous, lawless melting pot of a town that travels with and services the construction of the first transcontinental railroad, an engineering feat unprecedented for its time.