Nine year old Estella Garcia dreams of growing up to be a famous and glamorous movie star. She absolutely loves attention, but right now, she is feeling extremely nervous. She finally convinced her parents to let her go to her very first sleepover party! The party is at the home of a new fourth grade girl named Brittany, and the theme is art. Art is definitely not Estella's strongest skill, and she starts worrying about everything. Will she miss her younger siblings too much? Will the other girls want to stay up late and tell scary stories? What if she is the only girl there who has never been to a slumber party before? To calm her fears, she calls on her three best friends. Together, the Worry Warriors help Estella overcome her anxiety so she can pack her overnight bag, step out of her comfort zone, and ace her first big sleepover.