"AQUAMARINE is the story of Claire (Emma Roberts) and Hailey (Joanna "Jojo" Levesque), two 13-year-old best friends who embark on the adventure of their lives when they discover a mermaid (Sara Paxton) named Aquamarine in a swimming pool. Aquamarine had washed ashore after a big storm battered the small town Florida beach club where Claire lives with her grandparents. Claire and Hailey are trying to come to terms with Hailey's impending departure: She's moving to Australia with her marine biologist mother after this last weekend of the summer.