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Welcome to the true crime vault, home to 2020's most chilling stories.

It was a Friday night in a small American town in Waukesha, Wisconsin, and it was a scene playing out like so many across the country. A small group of parents had said yes to a sleepover, a birthday party.

Three 12-year-old girls were dropped off here at Skateland to begin the night.

But what would happen over the next 24 hours would haunt three families to this very day.

One of those 12-year-old girls, Peyton Leitner, was stabbed 19 times and left for dead in the woods. And the entire

scene was planned out by the other two girls.

What were you trying to do with her when you stabbed her?

Kill her. I might as well just say it. We were trying to kill her.

Because it turns out there was someone else looming large at that birthday get-together,

a fictional character named Slender Man, who they learned of on the internet.

And those two 12-year-old girls said they were doing this for him.

When Morgan said to you that if we don't do this for Slender, our families are in love ones are going to be killed.

Do you honestly do that?

Well, yeah, because he could be anywhere from 6 feet to 14 feet tall.

He constantly wears a suit.

He doesn't have a face. His skin is white. He can exploit these tendrils from his back and, like, struggles his victims.

...