How to Train Your Dragon Complete Series 1-12 Boxed Set, written and illustrated by Cressida Cowell. Little, Brown, published 2003-2015. Ages 7-11. 12 paperbacks in sturdy slip case. Very good to excellent condition (covers of books 1 and 2 slightly bent—see photos). No marks on pages. Text only. Cash (preferred) or Venmo. Discount on multiple items.