Did this one on audio with the kids and it is a solid three star. The audio version really deserves only two stars because Jesse Bernstein is almost unbearable. His voice in general isn’t very pleasant and when he tried to do other voices for effect it was downright terrible.
Anyway, as far as the story goes, Percy has another quest to go on to save the world, stop the titans, and figure out being a teenager. Yes, it is remarkably derivative of Harry Potter, but still entertaining. I’m hooked enough to see how it all pans out and for a book solely read for enjoyment, that is enough.