9: Texas Standoff
Author: Elmer Kelton.
Plot summary:

Ranger Andy Pickard and new partner Logan Daggett become involved in an investigation of killings and stolen cattle, and find themselves in the middle of
a 4-way fight, among two powerful cattlemen, a group of masked vigilantes called "regulators", and a hired assassin.  Old resentments, mixed loyalties
and misplaced trust feed the flames of battle.  Andy and Logan may lose their jobs, even their lives, before their work is done.
Approximate Run Time: 6 hours
Release Date: December 2010
ISBN: 978-1-59950-702-6