Jax can't wait to get started on her first mission with her magical moon cat Moonbeans, but just imagine her horror when she realises that it involves nothing less than helping the snooty Ruby-Rose. Ever since she became the girl in the Sparkle Fluff advert, Ruby-Rose has thought she's better than everyone else, so Jax cannot even begin to figure out why she needs a little moon magic. But when Ruby-Rose's dog, Betty Boo, asks Jax and Moonbeans for help, Jax springs into action, determined to make friends with Ruby-Rose. Soon, she realises that things are not always as they seem, and it takes more than a burst of fame to make someone a shining star ...