The ceremonies and sacred places of the Hopi on the mesas in their reservation are mentioned often and incorporated in the plot. Hillerman says "Like Jim Chee of the Navajo Tribal Police, I am an outsider on the Hopi Mesas. I know only what one learns from long and respectful interest, and suggest that any of you who wish to learn more of the complex Hopi metaphysics turn to more knowledgeable writers. I particularly recommend "The Book of the Hopi" by my good friend Frank Waters."