Two intrepid sisters, Juliette (4) and Carmen (8), discover a passage to the extraordinary world of their favorite book, the Kingdom of the Air Streams. Transformed into cats and separated from each other, the girls will have to be bold and daring to find their way back to each other and, with the help of the singer Selma, to their real world by confronting Sirocco, the master of winds and storms... But is he as terrifying as they’re fearing?