Northern Lights by Philip Pullman.
I first read Northern Lights when I was 12 or 13. I found it really interesting reading a book I loved as a kid. There are so many references to the bible and greek mythology that I just didn’t get the first time I read it. I actually found out that the series was originally named The Golden Compasses, after a line in Paradise Lost. I’m really excited to continue this series and will hopefully be buying The Subtle Knife at some point this week. I though I would be able to wait till after Christmas before buying it but I can’t.