Three teenage friends struggle with the challenges of school while trying to keep a well-hidden secret: they are mermaids. When their secret is exposed on social media, they embark on a journey to a secret island, where they hope to give up their magical powers. Their adventure is full of surprises and the unexpected, and the girls discover what truly matters in life.

Arriving on the mysterious island, the 3 mermaids try by all means to give up their magical powers, but those who hunt them are closer than ever. Selena, Milen and Lena will need new powers and a lot of help to face this new challenge.

The three mermaids want more than ever to give up their powers and discover the legend of an enchanted crown that can grant any wish. But the crown seems to hide a well-kept secret that could destroy their peace forever.