Seed of Evil (Wilderness Series, Book 65‪)‬

The King family has always appreciated the remoteness of their valley deep in the Rocky Mountains. There, they have all the freedom they could desire. But the long trip to Bent's Fort for supplies is one of the few downsides. All that changes when a newcomer opens the first general store in their region. The mountain men and scattered settlers are delighted — until people start to disappear, and dark whispers hint that a seed of evil has taken root in the wilderness.