The one where we have a big snake, a magic book and the pretty but dumb defense against the black arts teacher. And Dobby of the famed sock. This was a good follow up to the first novel. It solidified the rivalry between Draco Malfoy and Harry Potter. Introduced Draco's father as one of the main vilain along with Voldemort aka Tom Riddle. This was the last really children book in the series. Rowlings was still on the fence in my opinion and went for a more young adult crowd starting with the third book.