Cora is a typical 11-year-old girl whose birthday just so happens to share the date with the opening of a local amusement park. But with its hidden worlds, secret portals, and strangely high number of missing persons, this park becomes notorious for the strange things that happen within its walls.

After years of preparation, Cora herself is determined to solve this mystery and galvanize a population that had lost faith in themselves. They all split up, and victory is at hand, but Cora soon finds that in the little town of Hourly, time passes a little differently for some people—and the mysteries are even bigger than they seemed.

Cora finds herself on a roller-coaster adventure that sees her scaling cliffs, defying all odds, and rallying an entire community into action. What part does Cora really play in the mess of Hourly, Washington? Will Cora solve the mystery, change the lives of the residents of Hourly forever, and restore hope to an entire community…or will she be lost herself?