"Meet Oona. The big sea's littlest mischief-maker. She and her best friend, Otto, love to search for treasure... but often find trouble instead. Messy trouble. Tricky trouble. Even shark-related trouble. That's never stopped them before, though! After all, no proper treasure hunt is without some adventure. But when the grandest treasure yet is stuck in a deep, dark rift, Oona's not sure if she can dive right in"--Dust jacket flap.
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