Back in the camp, speak to Uncle to start this mission. Some of the girls will tag along so take the reins and drive the wagon to Valentine. Along the road, you’ll encounter a coach moving erratically. One of the horses breaks off so pull over and talk to the coach driver. He’ll ask for your help in getting the other horse back.
Equip your lasso then capture the horse with it. Approach the horse from the side (not behind to avoid getting kicked) then interact with it to calm it down. Once it calmed down, bring it back to the coach driver to complete this sequence and earn honor.
Continue driving to Valentine and park the wagon in the marked spot. The gang members will disembark and go with their own business. Follow Uncle to the general store and check what you can sell. To continue with the story, get some coffee then leave the store for a cutscene. Head to help Tilly at the side of the hotel. Enter the hotel next and talk to hotel owner to ask about Karen. Head to room 2B and kick the door open. Beat up the guy to rescue Karen. Leave the hotel for another cutscene.
Give chase to the man from Blackwater and keep following him until he gets accidentally thrown at a cliff. He’ll be dangling precariously from the edge. Approach him and you’ll have the option to either kill him or question him. After questioning him, you’ll get the finally decide whether to help him up or kill him.
If you help him up, you’ll get a steel pen from him and gain some honor as well. The pen can be sold for a good amount to fence or you can keep it as a souvenir. Mission complete.