Amazon says this is for grades 4-6.
From the back of the book:
Everybody has a secret. Mine's a little different though. I didn't even know about it until the first day of swim class in seventh grade. You see, I'd never been allowed to go in the water before. As it turns out, swimming comes naturally to me. Very naturally. In fact so naturally that you might even say...well it's true. Here's my secret:
I figured out that I'm a mermaid.

I left this in the glass case in the lobby of the Meeting Street Inn.
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