What could be more magical than having a unicorn as a best friend? For nine-year-old Phoebe Howell, it all started while she was shkipping rocks across a pond and accidnetally hit a dazzling but self-absorbed unicorn named Marigold Heavenly Nostrils. Together, the unlikely BFFs discover a world full of magical mysteries and adventure, taking on everything from cruel classmates to candy-breathing dragons.