Les aventures du jeune Rémi, orphelin recueilli par la douce Madame Barberin. A l’âge de 10 ans, il est arraché à sa mère adoptive et confié au Signor Vitalis, un mystérieux musicien ambulant. A ses côtés, il va apprendre la rude vie de saltimbanque et à chanter pour gagner son pain. Accompagné du fidèle chien Capi et du petit singe Joli-Cœur, son long voyage à travers la France, fait de rencontres, d’amitiés et d’entraide, le mène au secret de ses origines…
Raised by a kindly peasant woman after being found as a baby, ten-year-old Remi is brutally taken from his adopted mother and sold by her husband to Signor Vitalis, an old travelling street musician with a shadowy past. Remi sets off on a long journey through France with his new master, their faithful dog Capi and mischievous monkey Mister Joli-Cœur.
From adventures to misadventures, young Remi endears himself to Vitalis, who teaches him to read and helps him discover his extraordinary singing talent. The boy learns the rough life of a travelling showman and suffers through hunger, cold and sometimes great injustice. He also learns life, makes great friends and gains a mentor and father in Vitalis.
But when the clothes he was found in as an infant and a mysterious lullaby from his distant past bring him closer to his origins, Remi is suddenly faced with a new set of challenges that could reveal his true identity and change forever the course of his young life.