Twelve people set aside their fears and ride a roller coaster, including one who has never done so before.

Even though Zach finds roller coasters scary, he rides one with Grandpa in an attempt to make him happy again after Grandma's death.

Frank and Joe are excited to learn that Thrill Kingdom, their local amusement park, is having a contest for kids to design a brand-new ride. And they're even more excited that their friend Phil is entering. But on the day of the contest, someone ruins Phil's roller coaster contest entry. Since it had been kept in a locked room while awaiting final judging it's up to Frank and Joe to figure out the twists and turns of this coaster caper!