I'm not joking when I say that I LOVE anything Ancient Egypt, and this series is no exception. Although I'm older than the target demographic (I'm 24), I still found this an action-packed read and could not stop turning the pages. I agree with the previous troper about similarities between this and Percy Jackson books, but for me, it still stood apart in its own right. The Egyptian gods were starkly portrayed, most of them not one-sided, although a couple did tend to lean towards stereotypes. Some might say it was disrespectful, but I was highly entertained by the quirks the gods had, particularly Bastet and Thoth.
The two protagonists are different in their own ways, with Sadie the snarky, impulsive one, and Carter more cautious, although tending to be more impulsive in battle. I liked how their relationship grew closer together, yet without any questionable character changes. They still bickered like many siblings in real life, but by the end of the first book, you could tell they already certainly cared about each other.