Tired and weary, Heyes and the Kid discover that they are accused of burgling a bank. They decide to go there and investigate, since their amnesty is at stake.

Also present is Blackjack Jenny, whose son Billy disappeared after telegraphing her about a job there. She is convinced that Billy and his friend Caleb are dead. Heyes and the Kid confront the bank manager, and manage to convince him that they are bounty hunters, and that they were on Heyes and the Kid's track far away when the burglary took place. That way he gives them the name of the woman who said that it was Heyes and the Kid who stole the money. But is there someone else involved?

After the Kid wins another duel (over a man who claimed the Kid was cheating), the boys are contacted and offered a job by a man called ""Doc"" Donovan. They are to come with him into Mexico, to rescue a hostage from Mexicans who only want their rightful money.

The Kid senses that Doc knows who they are, but they cannot be certain, and why would he hire them instead of collecting the fee?

They manage to sneak out the hostage, Mr Zulick, but are chased by the kidnappers. After a daring stunt, they lose their followers, and Mr Zulick can continue on his journey. Then, Doc turns them over to the sheriff...

But where is Mr Zulick headed and why? And why does the sheriff want to let Heyes and the Kid go?