Phoebe Howell and her sparkling companion, Marigold Heavenly Nostrils, visit "the science museum, [test] out an extra-special virtual unicorn reality, and [perform] in the school talent show. With the help of her best friend and an emergency sparkle transfusion, Phoebe learns about confidence, empathy, and resilience--and even how to live without her cellphone"--Back cover.