Oona and her best friend Otto love to search for treasure...and 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. What might be waiting for her in those unknown waters?

New York Times bestselling author Kelly DiPucchio and Coretta Scott King Illustrator Award winner Raissa Figueroa are back with another gorgeous and grand tale from the big sea's littlest mischief-maker, Oona!

Oona is on a mission! A baby beluga whale has lost her way from her family and needs help getting back to her icy arctic home!

But Oona and her best friend Otto have never traveled from their

...