A young girl dreams of being a mermaid. Her classmates calls her names and snicker behind her back. But she knows in her heart that mermaids are real. And one day, she's proven right, when she comes across a real live mermaid!

Mermaid and the girl become fast friends. They go swimming, have picnics, and even play tricks on local fishermen. But their time together is cut short, and they must say goodbye. Until one day, they meet again.

From the New York Times bestselling author of Dad By My Side comes another gorgeously depicted book bursting with whimsy and imagination that celebrates the power of friendship.