Mermaids are beautiful creatures of the ocean that are known for spending their days relaxing in their undersea paradise. However, Tallulah isn’t your average mergirl! She’s a band geek, a bookworm, and a little awkward. The Aquacuties, the most popular girls at Atlantis Middle School, have everyone on the tips of their tail fins, except for Sebastian, the cutest boy in sixth grade. Tallulah thinks he would never ask her to the Fall Dance, but if she was a beautiful Aquacutie, he might! Will a trip to the forbidden treasure chest be worth it? Will Tallulah finally ditch her nerdy mergirl life, including her best friend Nori, to become the popular mergirl of her dreams? Anything can happen when you’re a sixth grade mermaid!