This first novel in the "MacGregor Family Adventure Series" involves sinister pirate forces, strange sea creatures, hospitable native Caribbean people, and issues of environmental management and endangered species. Suddenly faced with the task of saving a lost Spanish treasure embedded in protected coral reef, four enterprising teenagers rely on their courage and scuba-diving skills as they explore and investigate the exotic waters and beaches of the Cayman Islands. Dr. Jack MacGregor is a zoologist who works to save the environment, his wife Mavis is a working paleontologist and their teenage children, though bright, dutiful kids, find themselves making common teenage decisions and mistakes. Consistently entangled in dangerous adventures in exotic locales, they must rely on their common sense, diverse skills, and daring strategies to survive.