I think that the 3rd book name is going to be empire... its all in wikipedia and there are rumors everywhere about it

uuuhhhhmmmm. . . . I think that there was a topic about this already. Im not sure but i think so. Im just being firm you have to make sure that there is a topic like this. But its okay. Everyone does it and to answer your question the book will be called Empire. Because it starts with the same letter as the others and has the same amount of letters as the others.

It has been confirmed empire and it will be green, you should really check other topics first- there's been loads like this.