Longarm and the Sidesaddle Assassin (Longarm Series #278)

Longarm locks horns with a lead-slinging lovely!

While riding the plains of Utah, two census-takers venture deep into Mormon country—and end up six feet deeper. Someone wants to keep the U.S. government in the dark about the local population—and U.S. Marshall Custis Long is called in to bring some light to the situation.
 
But before he can solve the murders, Longarm will have to uncover the identity of a mysterious, night-riding woman who has been warning trespassers to stay off Mormon land, and backing up her words with hot lead…