The Making of the Atomic Bomb

Exceptionally good book, but the title is misleading: It's much more about the making of modern atomic physics, and how that precipitated the bomb. They don't get to making an actual bomb until more than half way into the book. Still super interesting though and full of great side-stories about Bohr, Meitner, Einstein, you name ‘em. Should be required reading for anyone interested in physics.