Four researchers and an incessant back-and-forth of ideas – a hundred years ago, a new science emerged that shattered the boundaries of imagination: quantum physics. Its protagonists: Max Planck, Albert Einstein, Niels Bohr, and Werner Heisenberg. They explored the depths of atoms and grappled with a seemingly simple question: What is light? At a time when electricity first illuminated cities and cinema and photography began their triumphant rise. Thomas de Padova brings the feverish quest for answers to life through the encounters of the researchers. What fueled their creativity? Which ideas led them to wave-particle duality and the uncertainty principle? A captivating story about the joy of thinking, the glories and abysses of the 1920s, and the dance on the atom.