Age: I feel like this can be read to a younger age group, like Harry Potter, given its fantasy appeal. But, reading on ones own, this is definitely for middle school given its long chapters and more complex vocabulary.

For a first read, I'm sorry that I didn't read it awhile ago. An excellent fantasy book that uses a female protagonist whiz of mathematics to propel through universes to save her father. I found it interesting that Meg had real responses to situations far beyond the experiences of a girl her age, responses filled with fear, anger, and a desire to blame others. But, with the latter response, Meg's personality has been impinged upon by a dark, evil matter that morphs planets into submissive zombies. Although this book is filled with fantasy, it also provides understandable explanations that allow a young adult reader to see the story and not logical faults.