There's no "The" on your copy?
I confess that I looked it up on the Book Wizard. I'd never have figured it out otherwise. But DH just got home and I explained the guessing game we were playing. He knows nothing at all about reading levels, but I told him you & your DD were reading it and BAM--he guessed it. We just spent the last five minutes repeating the following:
Me: You looked at the computer screen!
DH: No, I just guessed it.
Me: How could you possibly guess it??? You must have looked!
DH: No, I just guessed it.
He's got some serious splinter skills, that guy.