Thirteen-year-olds Sloane and Amelia embark on their first paid detective job to find a time capsule buried on the grounds of Cedar Point Amusement Park, but encounter opposition from a vengeful schoolmate, the park manager, and a ghostly figure.

It all began with the mystery of the long-lost Hoal Jewels. Some had stumbled across the forgotten fact that the jewels even existed. That same someone wanted very badly to find them by using the seventh grade to uncover hidden clues. What that person never counted on was two of those seventh graders putting all the clues together. That person never expected a couple of kids to try to get to the jewels first. Thirteen million dollars can motivate...