The stagecoach : a John Treehorn mystery
(Book)

Who's the sheriff? Who's the bank robber? FBI Special Agent John Treehorn hunts for a killer who murdered an ex-Pinkerton Detective and his Wells Fargo clint on the Navajo Indian Reservation while transporting a valuable briefcase. The investigation takes a turn when Treehorn's ex-sister-in-law, Simi Bear, General Counsel for the United States Marshall Service, arrives to work the investigation. The bodies begin to pile up as a man in the Witness Protection Program turns up dead, while a second disappears. Soon threads tying all four to Mesa and Gutierrez drug cartels begin unraveling, exposing everyone's agenda. Treehorn learns the truth behind the cartels' involvement, and discovers the connection to the murder of his wife, Skyler, which finally allows him to free her chindi spirit. ,It is recommended that you read the series in order to understand the characters history and their motivations.