Olly's Treasure by Elaine Ann Alle. Olly loves cleaning the water in the Chesapeake Bay where he lives with all his friends. But when Olly spies a sunken ship just beyond the oyster reef, he decides to explore the old wreck to see if there is treasure on board. When Olly arrives at the sunken ship, he finds all the treasure he could ever imagine, with silver vases, gold coins, and shiny gemstones everywhere he looks. But what is treasure without a friend to share it? Journey under the Chesapeake Bay with Olly and his friends to learn why his oyster reef is all the treasure he needs. Pre-K to grade 3.