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 warm ocean waters before. Will old ship maps and a compass be enough to lead them through the dangerous storms ahead?  Oona may be a little mermaid, but she is determined to see this big adventure through! With a bit of bravery and help from some new friends, they'll do all they can to reunite this baby whale with her pod once more. In this third installment from New York Times bestselling author Kelly DiPucchio and artist Raissa Figueroa comes a stunningly illustrated tale about the lengths a tiny mermaid will go to as she dives headfirst into uncharted territory to help bring a friend home.