I was initially hesitant about buying this book, and left it sitting on my wishlist for a while, wondering if it was a cynical cash-in on the popularity of Harry Potter. It's most definitely not.
As both a fan of popular science and a Harry Potter-obsessed adult, I found "The Science of Harry Potter" a very enriching read. The insight and detail regarding Potterverse references reveals Highfield to be a genuine fan, choosing exactly the right examples even where another event character might, on shallow reading, seem to be a more obvious choice.
I found the science comfortable to read, enjoying the detail without ever feeling stretched or confused, and it provided an interesting perspective on scientific disciplines that I'd met before, as well as introducing a few new ones. The range of subjects covered is huge, and yet there's no sense of oversimplification. The subtitle (How Magic Really Works) is slightly misleading, as the book covers everything from the effect of Slytherins on the spirit of goodwill to the intelligence of post owls, and too many other great topics to list without producing a novel-length review.
Adult and older teenage fans of Harry Potter who enjoy popular science (or are interested in exploring the genre) should find this an absolute joy.