Meet a brave little mermaid searching for a very special treasure in this heart-warming and gorgeously illustrated celebration of friendship, creativity and digging deep for determination! Meet Oona. She's a little mermaid who loves special treasure and big adventures - and often ends up in big trouble! But with her best friend Otto by her side, Oona is on the hunt for the grandest treasure of all - and she's about to find out it's not what she thought it was... A wonderfully watery tale of friendship, creativity and digging deep for determination, Oona is about to be your new best friend! From the New York Times bestselling author Kelly DiPucchio and featuring the extraordinary illustrative talents of Raissa Figueroa.