Nathaniel King left New York City in 1828 to venture into the vast unexplored regions beyond Mississippi. He heads west, lured on by dreams of wealth based on his uncle's promise to share with him "the greatest treasure in the world".

Matt Bardoul was a good man to have as a friend and a bad one to make trouble with. He was also a single-minded drifter—until he met his match in an outspoken beauty named Jacquine Coyle. She was headed into the Bighorn Mountains with her father and an expedition in search of gold. After Matt signs on to join them, he discovers that there is a group of outlaws in the party—gunfighters and thieves that Matt wouldn’t trust for a minute.

When Zach Connors and his pa left their Kentucky homestead in the summer of 1824 to see the Rocky Mountains, he didn't realize he would never see his childhood home again or that he would find love, friendship, fame, and a new home in this wild and harsh wilderness. After a grizzly kills his pa, Zach struggles to survive a cold and brutal winter alone. After killing a rouge grizzly and fighting hostile Indians on his own, he becomes known as Grizzly Killer and is respected throughout the West. Along with his dog, Jimbo, whom the Indians call the Great Medicine Dog, he finds Running Wolf, an injured Ute warrior, and together they fight off a hostile war party. They rescue two Shoshone sisters from the brutality of a French trapper and take them as wives.

On nothing more than a lark, he leaves his family and begins a journey from Ohio westward. Along the way, he runs up against badlands and bad men, loses his freedom, gains his freedom and learns the first rule of the frontier: Do whatever it takes to survive. With ruthless enemies after him - both White men and Indians - he’ll head for a place as brutal as it is beautiful - the wilderness of the Rocky Mountains.

Joe Pickett is the new game warden in Twelve Sleep, Wyoming, a town where nearly everyone hunts and the game warden—especially one like Joe who won't take bribes or look the other way—is far from popular. When he finds a local hunting outfitter dead, splayed out on the woodpile behind his state-owned home, he takes it personally. There had to be a reason that the outfitter, with whom he's had run-ins before, chose his backyard, his woodpile to die in.