This is a Leaphorn, Chee, Manuelito novel set in Navajo country.
For those familiar with Tony Hillerman's series about Lieutenant Joe Leaphorn of the Navajo police, this is a continuation of the series by his daughter, Anne. I just picked up this book while out shopping and have not started it yet. But I've read all of Tony's books and Anne's previous books that carry on where her father left off, so I am sure that I will like it.
Anne's writing style is different from Tony's of course, but she keeps the characters true to the personalities and traits that Tony established. She spends more time on the female character of Bernadette Manuelito that Tony created and fleshes out her character more, but at heart, it is the same Bernadette.
According to the back cover (paperback) description, Sargeant Jim Chee and his wife, Officer Bernadette Manuelito, both get involved in separate murder cases miles apart from each other. Chee is at Antelope Canyon and Lake Powell following up on an old mystery that Joe Leaphorn discovered years earlier.
Meanwhile, back home at Shiprock, Manuelito witnesses a murder and goes under cover to investigate further.
Both Chee and Manuelito end up in life threatening situations.