Endworld: Yellowstone Run (Endworld Series, Book 23)

Blade is enjoying some time with his family when he gets an unwanted visitor. Star, the leader of the Flathead Indians, has come to ask for help. Small towns in western Montana are being attacked and the inhabitants have vanished without a trace. The only clue is a survivor that claims his family was abducted by bear-men mutants. Now Blade has an obligation as the leader of the Force to investigate. He takes his buddies in the Alpha triad, Hickok and Geronimo, with him. He also takes Achilles, his choice for the open warrior position along. Achilles is a competent fighter but Blade’s choice is running into resistance from the elders and his fellow warriors. The problem is Achilles rubs people the wrong way with his conceited arrogance. Blade hopes to show that Achilles is qualified to fill the vacant position. They land in Yellowstone and find the park in the same condition as before the war. They also find the Breed. After the war a group of survivalists settled in a valley in Idaho. The lake they used was later found to be contaminated by chemical canisters dropped by a bomber. The chemicals have transformed the inhabitants into bear like mutants. Now the mutants want to expand. They plan to convert thousands with the contaminated water into the Breed and the humans not turned can be used as the mutants favorite food source.