The Thea sisters and the secret treasure hunt

"Thea Stilton sends Colette, Paulina, Violet, Pamela, and Nicky on a school project exploring in and around Whale Island in search of treasure. When a bad storm interrupts their scavenger hunt, separated, the Thea Sisters must rely on their individual knowledge and skills to make it through the storm and realize the true treasure is being themselves!"--Amazon.