Donnie Chronister, 15, sails with his family toward the Florida Keys. Their goal: a lost key where Spanish treasure may be buried. This becomes Donnie's obsession, although many obstacles lie ahead on their voyage. They delight in beautiful sailing days, snorkeling in clear waters , seeing gorgeous sunsets and brilliant star-lit nights, and the camaraderie among the youthful crew members. At last they find the key that may contain lost treasure. What lies beneath the small island's sands, however, is less important than their discovery of the deeper meaning of "a key to the treasure." In this fast-moving story the author's creative skill and long experience with sailing have produced an entertaining and inspiring narrative for young readers.