Mary is a girl who doesn't love studying. When her mom tells her "School's over", she jumps for joy. However, she loves music and rhythm very much. With her favorite metronome, she counts not only musical measures, times, quarters, eighths, rhythms, rests, and intervals. But also names, arguments, paradoxes, unprecedented events, and catastrophes. And together triumphs and miracles...

The fictional biography of Maria Callas, the greatest voice of the twentieth century in the field of opera.