Bo Creel and Scratch Morton come home to Bear Creek after a ten year absence to strange circumstances. People that meet them, known to both, seem terrified of Bo. Even Bo's family seem a little put off by him.
They soon learn that two women, saloon girls, have been killed, sliced up with a big knife and the one witness to one murder has described the killer, then drew his picture, which has been identified as Bo Creel by folks that know him.
He's quickly arrested and seems in danger of lynching, led by the Fontaine family already in a semi-feud with the Creel clan. The boys had already figured the murders had happened a month before when they were working for the hanging Judge Parker two hundred miles away. A telegram sent by Scratch gets the reply that Parker is away on business. It's left up to Scratch to find the real killer before it's too late.
The killer must be Bo's double, seemingly impossible on the surface. But there could be no other explanation. Find the killer and what's going on is the task laid before Scratch Morton.
Or his lifelong friend will be lynched. Only one hardheaded marshal stands between the Fontaine clan and a bunch of liquored up townspeople.