Basic horror subplot of new people coming to untouched land and finding an ancient evil. What makes it different is the setting, a hippy commune in northern CA. Knowing the author grew up in a similar situation it almost reads like a revenge story where she kills the people she grew up with.
I had a hard time liking any of the characters as the adults are so clueless as to be stupid and you can see the problems said cluelessness causes even without the supernatural element. Interesting story, and I'm glad it didn't glamorize life on a commune.