The Dark Wind (1982)

In some versions of Navajo traditional beliefs, when people die, their ghosts, which are understood as their essence or spirit, can linger in the place of dying and possible cause harm to the living. The Navajo word for a ghost is “chindi," and chindi is associated with ghost sickness, a malaise that can manifest through a variety of physical, mental, or emotional symptoms. There are very specific precautions used to prevent ghost sickness, such as avoiding all contact with the deceased person's belongings, destroying the person's possessions whenever possible, and removing footprints from around the site of the grave. Additionally, if a Navajo were to die inside his/her dwelling place, their ghost is thought to be released into the room, where it can remain for a long time. If this happens, then the hogan would have to be permanently vacated in order to avoid potentially infecting any Navajo who entered it. In such cases, the dead person would either be left in the hogan or brought out of the structure through a hole made in the northern wall. After the deceased has been removed from the hogan, the house is never to be inhabited again in hopes that the ghost will eventually leave through the same hole that was made in the north-facing wall.

In the Navajo belief system, ghosts are generally not perceived as malevolent, but as a natural phenomenon that is part of the transformation entailed in the dying process. Right before death ghosts are often described as dark shadows, and after death they may reappear on earth in the form of an animal, whirlwind, or certain unusual sounds and movements. Ghosts tend to become malignant forces when the corpse is not handled properly in the prescribed manner set by traditional customs.

Sagebrush, often shortened to "sage," is the name of a group of plants that are commonly referred to as sagebrushes or sageworts. These are plants in the genus Artemisia, a large genus in the daisy and ragweed family, and are often used as a culinary herb or tea in different cultures around the world. The sagebrush that is native to the American Southwestern regions is a low-growing bush that is characterized by its grayish-green color and aromatic leaves.

Sagebrush is widely used in various Native American ceremonies, and is thought to have cleansing and healing properties. Traditionally, sage leaves are dried and tied into bundles that in English are called "smudge sticks." when the end of the smudge stick is lit and allowed to smolder, the dried, tightly-bound sage leaves burn slowly like incense, producing thick smoke that is believed to act as an energy cleanser and protector for a person or a dwelling place.

In the context in which Tony Hillerman tends to use the word "harmony," it refers to the Navajo concept of hózhǫ́, the state in which all living things are ordered, in balance, and walking in beauty. The opposite of hózhǫ́ is hóchxǫ́ǫ́, which refers to disorder and chaos in one’s life. In Hillerman's work, chaos and imbalance manifest as as physical or mental illness, infections of the body and souls contracted from contact with mainstream U.S. culture.

The steep, vertical edge of a mountain, hill, or mesa. Cliffs expose the rock types and different earth sediments of the mountain, and can be created either by erosional forces or by structural forces. Erosional cliffs are created when the rock is weathered down starting at their base. Erosional cliffs are prevalent in areas with mountainous sandstone or sedimentary rocks that are prone to weathering. Structural cliffs are created with fault displacement or when a significant landslide occurs. In most cases, there is a sudden large drop past the edge of the cliff, creating a dramatic change in elevation between the top of the geological formation and the bottom of the cliff.

The flat valley or other ground that is bounded on two sides by steep vertical walls. This almost creates a v-shaped gap in the landscape. Canyons are often formed by rivers and streams, which have cut through the rock of the earth and created a deep valley. A famous example of a canyon is the Grand Canyon in Arizona. This canyon was created by the Colorado River which, through preferential erosion, incised the canyon into the bedrock. Canyons are numerous in the southwestern United States due to the specific environment of the region and the erosion that has occurred there over millions of years.

A trading post is an establishment where goods can be traded. It is also a social center where news and gossip are exchanged. Trading posts have been associated with American frontier culture since the seventeenth century. Over time, trading posts developed into a cultural institution at first funded and backed by empire, later by national interests, and most often by enterprising business men.

Trading posts became centralized hubs in a network of exchange that both participated with and circumvented the burgeoning capitalist system that was imported into the Americas along with settler colonialism. Although trading posts were initially intended to provide support to the European traders and trappers who traced their way across the North American continent, Native American groups were also drawn into the posts' exchange network. Native Americans traded furs, pelts, and even scalps for finished goods such as steel knives, firearms, woven textiles, food stuffs, and alcohol. Although not every post was poorly managed, trading posts earned a nefarious reputation for taking advantage of Native traders by offering poor exchange rates, trading products that were infected with diseases, and promoting the purchase and use of alcohol.

Many trading posts are still in existence. In the Southwest, they still symbolize "the frontier" as they are located as at the dividing line between "wilderness" (Indian country) and "civilization." Today, trading posts can be reached by pickup truck, tourist RV, and even the occasional horse. Many trading posts are also preserved as National Historic Sites.

Witches are people, men or women, who practice witchcraft. In many cultures witches are typically believed to be female. In Navajo societies, witches are most often believed to be male, although older people and women without children are also believed to be witches. These witches cause harm or illness to the people they curse or who encounter them. This sickness can be cured by completing curing ceremonies.

In the Southwest, there are strong concepts of witchcraft for both the Pueblo groups and the Navajo. For the Navajo, witches may also refer to Navajo wolf, wolf, or skinwalker. In some Native American legends, a skinwalker is a person with the supernatural ability to turn into any animal he or she desires. In addition to transforming into animals, the skinwalker has other powers. He or she can read others' minds, control minds, bring forth disease, destroy homes, and even cause death. While Europeans warned of a wolf in sheep's clothing, certain tribal beliefs cautioned against a human in wolf's clothing. Literally, the Navajo wolf, or witch, can also be referred to as a skinwalker.

A large piece of rock that has been detached from a larger rock surface by weathering, whether physical or chemical.

A form of cleansing one’s body using heat to encourage perspiration while in a structure with little to no ventilation. In the Navajo tradition, sweat baths are completed in a sweat house, which is a smaller form of the ordinary hogan, except that it has no smoke hole, as a fire is never kindled in it. Stones are heated in a fire outside and carried into the house, where they may then be doused with water and herbs to produce aromatic, healing vapors.

A seep, also known as a gravity spring, is an area where water slowly oozes from the ground and collects. A seep is created when the water table intersects with a fissure in the ground surface, causing the water to be pushed up through a fissure and collect on the surface.