In the shrouded town of Arville, the legend of a boogeyman named Slender Man-a faceless terror-stalks the minds of it's residents as children disappear into the night. Marlie and her group of friends, driven by a thirst for truth, embark on a quest to debunk the myth. But as they probe the shadowy woods, reality warps, and they find themselves ensnared in the very tale they sought to dismantle.