Fablehaven Series by Brandon Mull

I love this series. It's so fun. I've even read it twice - which only happens when I really like a book. The series is about a brother and sister who discover a whole new world literally in their grandparents backyard. Mull's writing is captivating, fluid, and entertaining. The protagonists are very human - meaning they have faults that drive you crazy, but you still find yourself loving them. Originally, I had put this series on par with Harry Potter, but I'm afraid, Harry Potter is on its own plane and it's very difficult to find a series as good. Still, it's great. Enjoy!