Though he may be retired, Navajo Tribal Police Lieutenant Joe Leaphorn hasn’t lost his curiosity or his edge. He’s eager to help Sergeant Jim Chee and his fiancée Bernie Manuelito with their latest case—clearing an innocent kid accused of robbing a trading post. 

Billy Tuve claims he received the precious diamond from a strange old man in the canyon. Could it be one of the gems that went missing in an epic plane crash decades earlier? Now that it may have resurfaced, it’s attracted dangerous strangers to the Navajo lands. 

Proving Billy’s innocence won’t be easy. Leaphorn, Chee, and Manuelito must find the remains of a passenger who died in the crash—one of 172 lost souls whose remains were scattered across the magnificent tiered cliffs of the Grand Canyon.

But nature may prove their deadliest adversary. To find the proof they need, the detectives must battle a thunderous monsoon and a killer as they plunge deeper into the dark realm of the Hopi Lord of Death—the guardian of the underworld known as Skeleton Man.