This book surprised me. It’s mostly about things I learnt on my maths degree and mostly hated at the time. Linking the whole history of the exploration of prime numbers, which mostly comes down to trying to prove the Riemann hypothesis, together with the background and biography of the mathematicians involved, the reasons why they were exploring this problem, and modern day real world applications makes it really interesting though. Wish I’d read it about 18 years ago really.