Help Nancy and her friends find out whos causing a major pool party problem in this first book in an all-new, interactive Nancy Drew chapter book series. Includes space for readers to jot down their own ideas and solutions to the caseSnooty Deidre Shannon writes in her blog ``Dishing with Deidre`` that since eight is half of sixteen, shes entitled to a Super Sweet Half-Sixteen party this yearAnd since the Shannons have a pool, shes decided to make mermaids her theme. Nancy, Bess, and George are invited to the big bash, where all party guests must dress in under-the-sea-themed costumes. For her grand entrance, Deidre dresses as a mermaid and is carried out on a giant half-shell by six teenage ``sea creatures.`` The garden boasts hedges clipped into the shapes of various types of ocean life. Deidres father even booked ``Queen Mermaid Marissa`` to perform in their pool--fin and all. But when a squirmy snake is found swimming in the pool too, Queen Marissa leaves in a huffWho would sabotage the mermaid pool performance? Nancy, Bess, and George intend to find out