This series centers around three characters: Kitty, Nathaniel, and Bartimaeus. The book is kind of like Harry Potter, only in my opinion, better. The moral values taught in the books are unforgettable. It tells of redemption and friendship.
The only reason I say iffy is because if you aren't old enough to understand the books, then the moral values can and probably will be confused.
For those who say the book is annapropriate and has nothing good about, you should finish the series and read 'Ptolemy's Gate'.