Yes. If you've liked the previous books in the series, then the fifth one is likely to be great too.
Definitely. It continues the story in an engaging way. It has all the elements that made the other books popular - magic, adventure, and interesting characters.
Sure. It adds new layers to the story. The plot gets more complex and the characters grow even more. There are new settings and exciting events that make it a worthy addition to the series. It also might answer some questions that readers had from the earlier books, which is really satisfying.