The kids at prestigious Greycliff Academy are in for a surprise when their hero, Kirby Finn, turns out to be something he's not.To his friends at Greycliff Academy, Kirby seems to have it all: charm, brains, and a lucky streak that won't quit. He's also the notorious hero creating the snarky videos “7 Good Reasons Not to Grow Up,” which expose just how dumb adults can be. Why would any kid want to become one of them?But there's also a mystery about Kirby. And when his be