Finally, I'm able to tell you about The Beetle Collector's Handbook.
I am writing a non-fiction companion to the Beetle Trilogy. You'll discover all the wonderful facts that Darkus finds in his Beetle Collector's Handbook and read his, and his father's, annotations in this book, which will be reminiscent of the nature books from the early 20th Century, with lyrical writing and romantic (but anatomically correct) illustrations, as well as helpful hints on how you can become a Beetle Girl or Boy.
The book will be published after the Battle of the Beetles, next summer. Read more here.