Empress (Adventures of Hopper book 4#7)

Thinking that she can just swoop in, care of Ewrin, and then swoop out, Abby will learn that it is going to be way harder than that. So, how hard is Ewrin? In what state of disrepair is it, and can it be curable? Lastly, does empress mean, Abby......or someone else; and will Kerina take her rightful seat, or will she be forced to take it? Finally, who is Adam?