Hiram the Elf has had enough?not only has Union Square Park been cleaned up and made safe, but everyone who visits the Square is so infernally nice. So with the help of Knut the rat, he launches a sneaky campaign to return Union Square to the bad old days.? A little dog poop on the walkways, a little soap on the monkey bars, and suddenly the regulars of Union Square are at war with each other. But a boy named Jack and his reporter friend Will know...