I have discovered a very LARGE, second-hand bookstore recently. I picked up about six books in this series (there are a total of four books) for my students to borrow. They were gone instantly.
The second book is the sequel to the first book. The third book is the PREQUEL to the first book. One of my students is reading the third book (before the second); he says he is glad he read it in this order. He wishes, actually, that he read the third book first. Hum?!?!