You can order volume 5 of The ABC Files in advance of its launch on Amazon on April 15 at the special introductory price of $2.99 (US) or $3.99 (Canadian). On April 15, the ebook will be automatically uploaded to your Kindle.
The paperback version of the novel will be issued shortly thereafter, by May 15. If you post a review of the ebook on Amazon before then, I may include an excerpt of your review on the back cover of the paperback.