Space Hoppers Silence on Saturn

"The year is 2281 and children are in charge of the Solar System! Space Hopper agents Dan Fireball, Astra Moon and their robot Volt fly around the universe fighting crimes and saving planets. Famous stars from around the galaxy are on Saturn for the Ringie Awards ... but it seems a little too quiet! Can the Space Hoppers find out why voices are vanishing or have silent movies returned to Saturn forever?"--Back cover.