Chancy Gantry and Ollie Teal are honest cowpunchers, riding herd on fifteen hundred longhorns from Texas to Kansas. Their trail boss, Lucas Stout, is tough but fair. He's never lost a hand on a drive and doesn't aim to start now. So when a cowhand needs a sawbones bad, Stout sends Chancy and Ollie to escort the man to a town called Prosperity, which none of them has ever heard of. At first glance, the town looks deserted - but the saloon is full. The dusty denizens of Prosperity are happy to help the ailing cowboy, especially when they hear about the herd grazing a few miles away. Chancy and Ollie are about to discover that some towns are a lot easier to ride into than ride out of.