Ed Caulder is a hired gun that accepts assignments through General Delivery mail. After completing a job, he asks for the route to Laramie where he is to receive another job. At Laramie the sheriff tries to persuade Caulder to leave town but he has to wait for the 4:00 pm stage for his letter. Jess has heard Caulder is in Laramie. Since he knew Caulder, he thought he might be the target so he decides to meet Caulder head on in Laramie. When Caulder receives his letter, he tells Jess he is glad he isn't the target so Jess leaves. At the ranch Slim suggests Jess take a trip which he does. On the way out of town Caulder asks how to reach the Sherman Ranch. His target is someone at Sherman Ranch but when Slim and Andy Sherman save Caulder's life he eventually ends up rethinking his contract. The men who hired him have other ideas about his quitting the contract and those ideas could prove deadly to Slim and Jess Harper.
—DarSpi