It was an ordinary day in the ordinary life of Henry and Ralph: two brothers whose life existed for mischief and mayhem. Get up, make a mess, and go to school. But today, was not an ordinary day. It started with the Mississippi River and something that should not exist. And then it invaded the school: a monster. A monster that adults don't see, and don't believe in. The boys are thrust into defensive mode, tasked with saving the school from a giant...thing...