Agnès, Juliette and Carmen's neighbour, writes children's storybooks that take place in a fantasy world, The Kingdom of the Winds. The intrepid sisters discover a passageway between their world and this extraordinary universe. Once on the other side, the girls take on the appearance of cats and discover Sirocco, a terrifying character who can control the wind.

David, a professor of dermatology, has been treating 13-year-old Romain since he was a baby. Afflicted with a rare skin condition, Romain must avoid sunlight and is condemned to live in the shade. David and Romain have become the closest of friends and nothing can separate them. But then David learns that he is about to be transferred to another clinic in another town. How will he be able to break the news to Romain? And how will Romain cope with this new crisis in his life?