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 clues. Soon, the sleuths find themselves not only solving a mystery, but helping out the last person in Aquamarina they'd expect . . . After the adventure, readers can turn to the back of the book to find STEAM facts about famous artists who incorporated nature, math, and science into their works!