Sharp Teeth of Love, The by Doris Betts; 1997. Hardcover.

In the High Sierras, a man, a woman, and a boy, each in psychological or physical danger, come together in a dramatic, satisfying way. At the center is Luna Stone, a young woman on the way to California who dumps her self-absorbed boyfriend in Reno and hides out in the mountains near Donner Lake. While camping, she has two visitors, the ghost of Tamsen Donner and a very live runaway boy, escaped from a child porn ring. This is Doris Betts at the top of her form.