Darina - Destroyer of Spells. Awakening of the Black Dragon

The Awakening of the Black Dragon — the fourth and final book in the series «Darina — Destroyer of Spells».
Darina and her friends constantly find themselves in the midst of the strangest events! This time, the whole group is kidnapped and taken to an island in the middle of the sea. But who and why? In search of answers, the kids track down their long-time enemies — the Meruan sisters and their mangy cat, Six-Tails, as well as a guest from the Deep Empires, who was promised a wonderful gift...
What are the devious Esselitkas plotting this time, and how can Darina disrupt their wicked plans?