In Tony Hillerman's The Shape Shifter, a lot is riding on a little mysterious carpet. Not any old welcome mat, but a precious Navajo tale-teller rug, full of portents, interwoven with bits of bark and feathers. Supposed to have been burned in a fire years before, the priceless artifact turns up in the pages of an interiors magazine, shown on the wall of a rich man named Jason Delos. After it's spotted by Joe Leaphorn, a retired Navajo policeman, and an old colleague of his (whose car almost immediately plunges down a canyon), the story ravels through an elaborate investigation of theft and murder.

Skeleton Man by Tony Hillerman

Joe Leaphorn, former Navajo tribal police lieutenant, is not a happy retiree. So when his successor asks him to look into how a young Hopi named Billy Tuve came by a valuable diamond the boy tried to pawn for a fraction of its worth, Joe finds himself involved in a five decade old mystery. It dates back to a plane crash in the Grand Canyon, one that took the life of a man whose putative daughter also has an interest in the diamond;

The Sinister Pig by Tony Hillerman

Sergeant Jim Chee of the Navajo Tribal Police is troubled by the nameless corpse discovered just inside his jurisdiction, at the edge of the Jicarilla Apache natural gas field. More troubling still is the FBI's insistence that the Bureau take over the case, calling the unidentifiedvictim's death a "hunting accident." But if a hunter was involved, Chee knows the prey was intentionally human.

The Wailing Wind by Tony Hillerman

A lost gold mine, a corpse in an abandoned pickup truck, and an eerie wailing heard on Halloween are among the delicious plot elements Tony Hillerman cooks up in his 15th novel featuring Joe Leaphorn and Jim Chee.

Hunting Badger by Tony Hillerman

Three armed men raid the Ute tribe's gambling casino, and then disappear in the maze of canyons on the Utah-Arizona border. The FBI takes over the investigation, and agents swarm in with helicopters and high-tech equipment. Making an explosive situation even hotter, these experts devise a theory of the crime that makes a wounded deputy sheriff a suspect -- a development that brings in Tribal Police Sergeant Jim Chee and his longtime colleague, retired Lieutenant Joe Leaphorn to help.