I will tell you all about the book, but first I want to tell you what it felt like to read it. It felt like being back at the beginning of my adventure into mathematics. It felt like the first time the history, culture, and philosophy of maths were unfolded before me.
I suspect maths in primary school would be greeted with far more enthusiasm if students had Ian Stewart as a teacher. Any man who can explain electromagnetism, gravity and atomic nuclear forces in terms of a piggy fridge magnet and a smashed kitchen plate is, surely, a communicator to be reckoned with.
Longitude was first published in 1996, occupying a substantial portion of many a Waterstones table around Christmas-time. The book has endorsements from Patrick O'Brien and Neil Armstrong, and a blurb that cheerfully describes the search for longitude as a "true-life thriller".