Rube and his machines may have saved the day last week, but middle school is just getting started!

One of Rube’s best friends, Pearl, is running for class president, and Rube knows just the gadget to help her win … or so he thinks. No matter what he does, all of his attempts to help Pearl end up backfiring. To make things worse, popular girl Emilia invites Rube to go with her to the big Switcheroo Dance—that is, if he invents something special to help her impress her followers online.

Meanwhile, shops around town are being forced to close as a mysterious corporation buys up their land. Even the Rosens, who own Rube’s favorite antique store, may get bullied into shutting down. Can Rube and his machines uncover the truth in time to stop it?