You might get lucky and find the story book as a reward for completing certain quests or missions in RDR2. Or, you could try trading with other players if multiplayer is available and see if they have one to spare.
You can try looking in the in-game libraries or bookstores. Sometimes they have story books available for purchase.
One option could be to check with the various merchants you encounter during your gameplay. Some of them might have the story book you're looking for. Also, keep an eye out for hidden chests or lootable areas as they might contain it.
You can find the story book at the general store in some of the towns. Sometimes, it might also be available from specific NPCs during certain quests.
You might find it by completing specific quests or missions related to Jack in the game.
You might find it in the game's main questline locations or in hidden chests scattered around the game world.
I'm not sure. You might have to look around different locations in the game world to find it.
The story book for Jack in RDR2 can be found in various places. You could try looking in the back rooms of saloons or in the hidden compartments of stagecoaches. Another possibility is to search the tents of outlaws' camps. Keep your eyes peeled and you might just stumble upon it.
You could look in book fairs or literary events. Sometimes authors or publishers showcase and sell their books there, and you might just come across Jack's story book. Another option is to ask at indie bookstores that focus on specific genres or authors.
To get the best horse in the RDR2 story, you could try exploring hidden stables, achieving high honor levels, or following specific questlines that lead to acquiring exceptional mounts.
You could try looking in online bookstores like Amazon. They often have a wide range of game-related storybooks.
You could try the local library. They usually have a wide range of story books for all ages.
You might find story books in abandoned houses or in the libraries of larger towns in RDR2.