A wonderful, wonderful book. I only wish I could read it earlier. This is likely one of the very best books I ever read. The “Harry Potter And The Methods Of Rationality” is very loosely based around the original characters and environments set by J.K.Rowling but really is a completely different book. And, at that, a much better book it is. Of course, this book would be hardly suitable or understood in full by the children before they at least have a solid understanding of logic and a little of various sciences. For adults, this is a feast. I will not go into any detail of the plot and characters, they are all amazing and the book is full of surprises. It’s best if you discover it yourselves. I will simply highly recommend you do discover it indeed.
The book is available here: https://www.fanfiction.net/s/5782108. Go read it if you did not yet, you will not be disappointed.
A local copy in PDF is available. A local copy in EPUB is available.