Something strange is going on with George and Alice's grandfather. It's not just his bare pantry or lost car keys. It's the weird way he's been acting, especially at night. He's seeing something out in the darkness. "Something terrible," he says. Alice suspects the Dwayyo - a legendary creature said to stalk the nearby woods. George doesn't know what to think. Is there a monster on the loose, or is Grandpa losing his mind? Along with their friend Callie, the siblings set out to find answers, and face their greatest fears.