This episode is about Payton Luetner and the tragedy she endured.

Sources:

https://www.oxygen.com/crime-news/slender-man-attacker-morgan-geyser-recaptured-after-wisconsin-manhunt

https://abcnews.go.com/US/investigators-slender-man-case-discuss-chilling-interviews-12/story?id=66320806

https://abcnews.go.com/US/slender-man-stabbing-victim-speaks-publicly-time-situation/story?id=66268385