Five years ago, young Landon Shrewsbury saw something that scared him to death: a giant, shadowy figure lurking in the woods around his house. Something that left huge footprints in his yard.

Now, at age thirteen, Landon has convinced himself he dreamed the whole experience. But in his hometown of Sugarcreek, Ohio, new reports of a mysterious creature haunting the nearby woods come flooding in.

When his parents leave town for a week-long vacation, Landon is left in his older brother's care. And to his horror, the frightening, shadowy menace from his childhood returns. Landon, his brother Kevin, and his new friend Tami suddenly find themselves being stalked by the fearsome giant known as the Grassman.

Now, the three of them must discover the reason for the beast's return — and find a way to stop its violent rampage — before they fall victim to its inhuman fury.