The only memory Sophie has of her mother is a desperate wave for help before their ship sank into the English Channel. Found floating in a cello case as a baby, Sophie has been raised by an eccentric and loving guardian, Charles, who taught her to never ignore a possibility. When ruthless authorities threaten to separate them and send twelve year old Sophie to an orphanage, they take a daring risk and flee to the bustling streets of Paris. Armed with a single clue about a mysterious cello maker, Sophie refuses to give up hope of finding her long lost mother. Her search leads her far above the cobblestones, where she befriends Matteo and a fearless band of urchins known as the rooftoppers. Together, they navigate a dangerous, hidden city among the chimney pots and starlight. You will hold your breath as Sophie scales dizzying heights, racing against time and the authorities in an unforgettable quest for family, freedom, and the extraordinary.