The 19th century physicist Ludwig Boltzmann stirred up controversy by proposing that scientists could make intelligent guesses about the behaviour of atoms, which, though they moved randomly, could be described by certain probalistic generalizations. His suggestion to explain thermodynamics by using statistical methods went against the longstanding trend of assuming absolute fixed laws. These were profound and disturbing changes. The movie is about the engaging story of science and personal struggle of Ludwig Boltzmann, set against the intellectual climate of nineteenth-century Vienna, and shows how science has come to accept the reality of the invisible world.