How to Train Your Dragon series comprises twelve children’s books, written by British author Cressida Cowell. She sets the books in a fictional Viking world and focus on the experiences of protagonist Hiccup as he overcomes great obstacles on his journey of Becoming a Hero, the Hard Way. Hodder Children’s Books published the books in the UK and by Little, Brown and Company in the US. They published the first book in 2003 and the last one in 2015. As of 2015, the series has sold over seven million copies around the world.