I've been looking into user roles and it would seem that there are 100 plugins to help me control what a user can edit or publish but they don't get any more specific.
We have a custom post type called Chapters and we have hundreds of users who can view said Chapters. What we want to do is add a new user role that can only view certain posts within the Chapters post type. So we have 51 Chapters and we only want the new role to see 31 of the 51 chapters.
EDIT: I'm talking about the front-end. Our site requires subscription to access it so the new user role would be a like a subscriber, only they couldn't see specific "Chapters"