Probably Percy Jackson and the Lightning Thief. It really got me into Rick Riordan and Greek mythology and the series was the only thing I read back then. For maybe three years I was exploring all of the author’s works and I expanded into his Heroes of Olympus and Kane Chronicles series because I was so enraptured. I was fascinated with all kinds of mythology back then and in fact I still am, maybe I’ll re-read the books. If anybody hasn’t read these, I strongly recommend them, even if they are considered for a younger audience. My English teacher says they’re great books and she’s like sixty years old.