Cressida Cowell on her new book, The Wizards of Once

Children's author Cressida Cowell is back with a brand new series all about wizards and warriors.

She's famous for her 'How to Train Your Dragon' books which she's been working on for the last 18 years!

But for the last five years, Cressida's also been secretly writing her new book, 'The Wizards of Once'.

Ricky's been finding out all about it and got a sneak peek at her special scrapbook filled with her new ideas...