Emily lives with her mom on a boat moored in the harbor of a seaside town. The only thing she knows about her dad is that he left when she was born. Emily's dream is to learn how to swim. However, her mom, for some strange reason, is afraid of water. When she finally manages to convince her, Emily will make an incredible discovery. She will begin to know herself and simultaneously explore the wonderful world at the bottom of the sea, where Poseidon reigns and mermaids go to school. There she will also learn the truth about her father... A beautiful story for those who love the sea and its secrets! [Excerpt from the text on the back cover of the edition]