Polly's odd, mad-scientist stepbrother, Damon, has always been home-schooled...until now. This year he's in Polly's class, where he doesn't look or act like any of the other kids. He's also decided to compete in the science fair, spending hours in his creepy basement laboratory. Polly doesn't know which is worse: that Damon's creating something truly sinister for the science fair--or that he might actually win!