On the hottest day of summer, Gortimer and his two best friends, Mel and Ranger, discover a way to end the heat by solving a mystery involving an intimidating neighbor and an even more intimidating frog.

While trying to help the unluckiest kid on Normal Street, Gortimer accidentally jinxes himself with bad luck. Now Gortimer, Mel and Ranger must find a way to set things straight before a wave of misfortune threatens Normal Street's annual Road Rocket Race.

When Mel worries that her rival is the frontrunner for this year's school science fair, she scrambles to build a project that will blow everyone away.