Documentary exploring the true story of how The Slenderman, a figure born from internet memes, became a focal point in an attempted murder investigation involving two 12-year-old girls, Morgan Geyser and Anissa Weier. The two girls lured their friend into the woods, stabbed her 19 times, and confessed that they committed the horrific act to appease a tall and faceless man online, known as The Slenderman.