“Why am I not allowed, Mom? Why can’t I go in the ocean?” Jenna raised her voice.

"It's dangerous. You know that."

Jenna Obrighton has never been in the ocean, ever, even though the ocean is her backyard. Ever since she can remember, she has always found the ocean intriguing and full of excitement of what she might find in it. Her parents, though, have made one rule clear: She is not allowed in the ocean. But why? Something happened to her grandfather, but what? Is that the reason her parents are keeping her away from the water?

Now in middle school, Jenna is determined to find out exactly what happened to her grandfather. She takes matters into her own hands to figure out who he was. If her parents won't tell her, she is going to find out for herself. Suddenly, Jenna finds herself on an adventure to search for the one creature that can tell her about her grandfather: a mermaid.