Overview
While on spring break in Florida. Joshua has to do a science project for his homework. His friends, who are part of a detective club called the Geckos, suggest collecting fossils, since the beach on Sand Castle Key is famous for sharks' teeth and other fossils.
But Sand Castle Key is also famous for something more sinister. There are rumors about strange creatures on the deserted island.
When the Geckos find weird tracks and an ancient silver coin, they uncover a myster that shocks the town!