The week of her tenth birthday, Alice and her parents go to Sanibel Island, Florida, just as they do every year, but this time some of the people who are always there are missing and some new people have come, which unsettles Alice, who wants things to be exactly the same as they alway are.

A young girl visiting her grandparents at the beach stays in a little house and walks along the shore gathering seashells, wondering about the creatures who used to live in each shell, about the hidden treasures of the sea--and about the world.