The unicorns of Sparklegrove Forest have a mystery to solve, in this magical series from the creator of the bestselling Owl Diaries series! Bo Tinseltail lives in Sparklegrove Forest, where lots of other magical creatures live. Bo and the other unicorns learn about dragons at school, but they have never seen them before. That is, until now! A blanket and a pair of glasses go missing from school, and the clues lead to the dragon caves! Will Bo and the other unicorns meet a scary creature there? Or will they make a brand-new friend?