A rabid wolf is spreading death, and the wilderness is no longer the greatest danger.
When Levi Johnson and Rusty Steel discover the aftermath of a brutal wolf attack, they race the survivors back to the Bear Tooth Mountain compound. As fear of rabies spreads through their friends, every passing day becomes a desperate fight for survival with no known cure.
Meanwhile, Captain Will Forrester rescues a mysterious Blackfoot woman and takes possession of a wagon loaded with valuable Scottish whiskey. But British spies, ruthless killers, and hostile warriors are all hunting the stolen cargo, forcing Levi, Will, Rusty, and U.S. Marshal Joseph Walker onto a perilous journey toward Fort Boise.
Winter closes in. Wolves stalk the mountains. The infected grow weaker. And every mile brings the mountain men closer to enemies determined to stop them.
And if Levi and his friends cannot survive the trail ahead, more than one life will be lost beneath the blood moon.