Arthur and Rose created the magical world of Roar when they were very young and until recently, they’d all but forgotten it exists. But when they must return to get their granddad back from the villain who still haunts their nightmares, Roar becomes part of their lives again. When the twins go back to Roar for their first visit after rescuing Granddad, they soon realize there’s no time to explore—Crowky, the villain, is poised to destroy their world. Arthur and Rose must once again become the masters of Roar to save the world they love—but they’ll need to confront their deepest fears to do it.