After unintentionally unmasking a criminal mastermind at his school's Contraption Convention, Rube Goldberg--and his inventions--are the talk of the sixth grade. Rube's star is on the rise, and it's a lot of pressure. What if he's lost his mojo? There's no time to wonder, because Rube and his two best friends, Boob and Pearl, are busy planning Pearl's campaign for class president. With the Switcheroo Dance a weekend before the big election, Pearl's path to victory is set. That is, until a new mystery strikes the town. Rube is eager to bring Zach into the fold, but Boob and Pearl can't help but wonder if Rube's mysterious new friend is hiding something . . . will Rube get his mojo back in time to unravel the mystery and save Pearl's campaign?

Hijinks and hilarity abound in this dynamic follow-up to Rube Goldberg and His Amazing Machines, written by bestselling author Brandon T. Snider and featuring black-and-white illustrations by Ed Steckley.