Twisted Hills (Ralph Cotton Western Series);

When wanted men don’t want to be found, they hole up in Agua Fría, Mexico. Nestled in the twisted hills of the Blood Mountain Range just across the border from Arizona, the town is divided by two ruthless gangs of thieves and killers. On one side stands Texas Red Madson, and on the other is Raymond Segert. 
 
Between them stands Arizona Ranger Sam Burrack. He rides into Agua Fría in the guise of a vicious gunslinger with a plan to ingratiate himself with both gangs—and stir up the bad blood between them into a war that will leave Burrack the last man standing…