Quantum by Manjit Kumar
One of the best scientific histories I’ve read for a long time, this book matches insight into the characters and lives of all the great players in the quantum mechanics debate with the theory itself. Too many authors get this balance wrong, but Manjit Kumar gets it just right. He’s especially good at leading the reader from the character of somebody (Niels Bohr springs to mind here, but he’s also good with Schrödinger and Heisenberg) to their scientific insight. I really enjoyed this book: well written, detailed, insightful, interesting.