When a big box arrives one morning, Bridget Fidget leaps out of bed and spins down the stairs. She knows what's inside'a unicorn! After all, she's always wanted a pet unicorn, so it must be a pet unicorn. But inside the box is just another . . . smaller . . . box. And it's buzzing. This is no unicorn. But could it possibly be something even better? For all kids who've ever wanted what they couldn't have (because it's a mythical creature or just beyond...