"Do you believe in unicorns? Phoebe does. She has no choice. One day she skipped a rock across a pond, and hit a unicorn in the face. Improbably, this resulted in a lasting friendship between Phoebe and the unicorn, one Marigold Heavenly Nostrils. Come along for the unicorn ride with Phoebe, as she deals with the usual burdens of childhood (cruel classmates, gym class, piano lessons) and also some unusual ones (magic hair, candy-breathing dragons,...

Phoebe, Marigold, and Marigold's sister, Florence Unfortunate Nostrils, are headed to summer drama camp where they'll face the daunting tasks of writing, producing, and acting in an entirely original play.

"Being best friends with a unicorn is truly incredible, as 10-year-old Phoebe Howell knows from experience. But what would it be like to actually trade places with a magical unicorn for a day? As it turns out, it’s much harder than it looks! Phoebe’s botched muffin spell turns the sky plaid. And things aren’t any easier for Marigold Heavenly Nostrils, who has no idea how to hold a pencil." --publisher's website.