Emily Windsnap's best friend, Shona Silkfin, is a mermaid who loves to sing but only when she is by herself. So when Shiprock School announces a talent show whose winner will have the honor of meeting King Neptune, everyone is excited to perform--except Shona, who is too nervous to sign up. But when Emily overhears her friend singing, she's amazed by Shona's beautiful voice. With Emily's encouragement, Shona decides to enter the talent show--and when she anxiously takes the stage, Shona knows that her best friend is cheering her on, giving her the courage to sing loud and proud in front of everyone, even the King of the Oceans.