I LOVE this cover, though. But the cover for Spider's Revenge is so much cooler ;)
This is an adult series, so, as always, you've been warned!! I know that Jennifer recently released a YA novel (which I have yet to read, sadly) but don't go on a binge of Estep-awesomeness and think "I'm so reading her adult novels!!" when you're less than prepared.
Adult novels, in my book (or mind...?) are nearly always acceptable for YA's (like me) over the age of 15. I know, I know, read whatever you want. But don't be surprised when you come across...ah, hem...content that is less than suitable for younger readers.
Either way, this is probably my favorite adult series. In case you're wondering ;)