A great continuation of the first book, but with the added element of switching chapters between Isoka and her sister Tori, back at home and living a life of luxury (or so Isoka believes). The interesting thing about the switching viewpoints is that Tori tells us more about Isoka, which gives us a much more rounded picture of her.
I look forward to the next book, as I'm very curious where events will lead (no spoilers) with both of them - and will there be a third viewpoint that comes into play? Essentially, the worldbuilding thus far in the first two books is FANTASTIC, and the characters are wonderful. Read them.