Every smile is a great gift, from one person to another. When a baby smiles at his sister, the joy she feels is so loud that she mobilizes a chain of kindness that is spreading all over the world ... and returns again. A moving story about the power of a simple smile and the joy it gave, by the creator of books a light for the night (Icarus, 2019), the dog is jazz (Icarus, 2019), the red and the city (Icarus, 2020 ) and the golden treasure (Icarus, 2020).