I love reading Hillerman. When you live in New Mexico you know first hand what he's writing about. That is until I was at page 4 of the "Fallen Man" and Hillerman described the autumn sun as being "far to the north" and "the shadow of Ship Rock .... stretched southeastward". That stopped me in my tracks right there and I had to read it again several times.
First of all, the sun sets far to the south in autumn and the shadows stretch northeast. The only way I could explain this error is perhaps Hillerman placed the scene in the late spring in an earlier draft, then changed the season without changing other details. I was disappointed that Hillerman didn't catch this.
In Roswell, New Mexico, I watch the summer sun set behind El Capitan Mountain that sits on the most northern point of the suns path through the sky. El Capitan looks like a pyramid and acts as a buffer from the strong rays of the setting sun. As the sun travels back to the south on the western horizen in the fall, I am very aware of its position because it shines right in my face as I drive home. That is first hand knowledge for you.
This small detail might not be important to a lot of people, but it was a glaring (forgive the pun) error on the writer's part.