When Ruth Rose and her friends, vacationing in Florida, discover that her grandmother is about to invest in a project to recover sunken treasure, they stumble upon evidence that the entire plan may be a fraud.

When Zack goes to Florida to visit Mel & Shirley's Wonderful World of Dolphins, he is surprised to discover that he can understand and speak to dolphins, which enables him to solve a kidnapping.

While in Florida to celebrate her Grammy's birthday, nine-and-a-half-year-old Sassy worries that an approaching hurricane will ruin not only the party, but a nest of sea turtle eggs, as well. Includes facts about hurricanes and sea turtles.

Jenny and John love their dog Marley, but they get frustrated when he keeps getting into trouble.