Max Brand 
Black Jack 

The moment he rose out of the chair and faced them, Gainor had stopped short. He was quite capable of fast thinking, and now his glance flickered from Terry to the sheriff and back again. It was plain that he had shrewd suspicions as to the purpose behind that call. The sheriff was merely confused. He flushed as much as his tanned-leather skin permitted. As for Terry, the moment his glance fell on the sheriff he felt his muscles jump into hard ridges, and an almost uncontrollable desire to go at the throat of the other seized him. He quelled that desire and fought it back with a chill of fear.