A unicorn at the boarding school for pony whisperers Annelie is in seventh pony heaven: On Companion Day, the handsome Henry has chosen her. Since then, she and her pony have been inseparable. Unfortunately, things aren’t going as smoothly between her friend Tille and the Shetland pony Fliederfloh. Tille has always dreamed of a unicorn - and Fliederfloh won’t do anything without magic sugar. Soon, veterinarian Ennimell raises the alarm and prescribes a diet. The next day, the magic sugar is mysteriously missing from the feed store. Is Fliederfloh a thief? Annie and her friends want to prove his innocence and follow the clues. But what they discover is truly unbelievable...