Definitely fun, and definitely a sequel. The series continues beyond this book, too. Write faster, Rick Riordan! :-)Great fun- inventive characterizations of Egyptian gods, great magic system. I read this, and had listened to the prequel as a terrific audiobook, so I still heard the two readers' voices in my head, alternating Sadie and Carter chapters to continue the action.Definitely works well in both audiobook and text formats. A fast, fun read, for kids,, and enough creative adventure to have adult appeal too I think!