The Marshmallow Mermaid

The plot centers around Halo McNightly, who investigates the mysterious disappearances of swimmers from the boys' swim team at her school. Her quest leads her to a deadly mermaid residing in a cave linked to the swimming pool. To confront this threat, Halo utilizes her unique candy, transforming into different underwater creatures like a hammerhead shark and an octopus, as she battles the dangerous girl-fish. The story combines elements of mystery, fantasy, and adventure in a school setting.