Three Rings of Justice — J.R. Roberts

The Gunsmith 404Clint Adams is killing time playing penny ante poker in Bellshade, Arizona when the circus comes to town. He learns from the local lawman that a young woman had been murdered in town, her throat cut—and that she is the sixth in a string of murders across the West. And, oddly, the murders are happening in towns where the circus performed. Because the sheriff can only operate in his own jurisdiction he asks Adams to become involved. The Gunsmith is reluctant, but in the end, in order to try to keep any other women from being killed, he shoulders the responsibility to stop the killer—and the only way to do that is to join the circus.