An amazing intro to Riemann Hypothesis and zeta functions. This 4 parts book starts with anecdotes and curious behaviour of numbers, especially primes, and moves on to zeta functions and the RH, taking a tour through generalised functions and Fourier transformation. It's a short but well researched book, not only in content, but in organisation, so that it feels almost effortless to move through the chapters. Despite the highly technical nature, the approach is seldom clinical. It builds suspense, piques interest and not unlike a thriller, leaves the reader to ponder.