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In many ways, this book had to grow on me. When the main character Greg was first introduced, I thought he was completely unrelatable! A kid who's good at everything!? How is that interesting? It took a few chapters, but Greg's creativity and industriousness finally grew on me.
Just as things were getting interesting, we met Maura. And again! I found her just as annoying and frustrating as Greg did - though perhaps that's a testament to the author's writing ability! Gradually, I grew to accept her, though I fell short of actually liking her.
The story is good. Greg comes up with a way to make money at school - an idea that impressively requires quite a lot of work and preparation - but his plans are foiled by the school principal. Meanwhile, he surprisingly finds himself in a position of sort of befriending Maura and working with her on a new plan. Together, they want to find a way to convince the principal to allow them to run their business in school.
I like that there's a lot of development - character development, product development, relationship development. There are also a lot of opportunities to learn something - how to go about figuring out how to get something done, how some things are worth more than money, how important it is to adapt in certain situations. There's a bit of humor, and the events unfold at a good pace.
I can see why this book might appeal to upper elementary readers. As realistic fiction, there's a sense of, "Wow, I could do that, too!"
I was disappointed, then, at the very end, when the story suddenly became over-the-top and not at all realistic.
Final note: There are a lot of math references in this book, making it possibly a good selection for young readers who generally like math more than reading.