When graffiti starts appearing on buildings all over Aquamarina, Violet and Wally follow the clues to find the culprit In Book 3 of the series, join the Undersea Mystery Club as they explore the ocean to help their aquatic friends It's the first day of school, and Violet can't wait to see all of her friends. But after a mysterious blob of paint appears on the school building, Violet and her best friend Wally get to work looking for...