Slender Man is a 2018 American supernatural horror film directed by Sylvain White and written by David Birke, based on the character which a same name by Eric Knudsen and Victor Surge
Plot[]
In the fictional small town of Winsford, Massachusetts, Hallie Knudsen, Katie Jensen and their friends Chloe and Wren approach a group of boys to probe their evening plans, but they are told that it is top secret. During a sleepover in the basement of Katie's abode, the girls discuss the boys' intentions to summon the Slender Man, a tall, slender, horrifying supernatural being with a featureless visage who is infamously known throughout the Internet as a menacing individual who primarily targets innocent children by seducing and then abducting them; they subsequently visit a website containing a link to a disturbing video that demonstrates how he can be reached. The following week, on a class field trip to the historic Clifton Cemetery, Katie becomes haunted by a paranormal presence in the trees. A short amount of time passes before she disappears without a trace, forcing the entire crowd of students to stay behind for hours until the police arrive to begin examining the premises. Deciding to hunt for clues at her dwelling, the other three recover her laptop, discovering that Katie, who had been unhappily living alone with her alcoholic father, had become involved in the occult, developing an unhealthy obsession with Slender Man sightings and videos and messaging Allison Riley, also identifiable by her online handle "AlleyKat93", regarding methods of reaching the character, who would spirit her away from her currently miserable environment.