I was fortunate to be one of the first 100 sign ups and got this book included.
Seems a great amount of reading for £0, and it involves dragons as far as I can tell so 
The only downside (before opening it) is that this is the third book (out of five, two haven’t been released yet) in a series so I don’t want to jump in midway through.
I’ll look to get the other books, as the synopsis on this one sounds interesting but it’ll take me a while to get to it