In A Mermaid Tail, there is a girl named Stella. She, her mom, and her best friend Sirena are spending the rest of their summer vacation in Paris. But there were a few mishaps along the way. At the airport Sirena took a bathroom break which almost lead to her secret being found. Mom quickly fi nds out that they left their dog, Ronnie back in Madison and takes a plane back trusting Stella and Sirena to stay behind on their own. Finally, the girls go to the beach where Sirena lives her worst nightmare. It happened...