I want to tell all of you that my plans changed... I am sad to inform you there won't be any other books for Mary and the others :'/ ... just realized that there is no need to create books for them to shine... I mean they are already main characters, but only with each other... I have many new great ideas about new books, and then the idea of separation appeared in my mind.... but applying those ideas on Mary and the others was a mistake. So I won't do this anymore, I'll try to focus on Copy Master for now. My other ideas will be on the shelf for now.
Sorry to those who liked the idea(including me), but I'll feel much more comfortable this way.