María and her mother are spending the afternoon by the sea when suddenly the girl finds a bottle with a message inside: ?SOS. I need help, and fast.? So María, full of curiosity, dives under the sea to find out who is sending these messages through the waves. A fable of foam and salt water, penned by Paula Carbonell and illustrated by Marjorie Pourchet, telling of the wonderful relationship between children, play and imagination.