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Both girls in separate rooms beginning to explain their plot to kill, referring to Peyton by her nickname, Bella.

Morgan tells the detective the plan to kill Peyton had been in the works for months.

Morgan tells the detective the plan to kill Peyton had been in the works for months.

Necessary. A word Morgan Geyser would use again and again with that detective. Saying her devotion to that fictional character, Slenderman, drove her to do this.

Necessary. A word Morgan Geyser would use again and again with that detective. Saying her devotion to that fictional character, Slenderman, drove her to do this.

Slender Man is the story of a character who suddenly appears. He changes and evolves all the time, with help from fans all over the world adding to the story, giving a fictional character new life every day. You have said that Slender Man is the boogeyman.

Slender Man is the story of a character who suddenly appears. He changes and evolves all the time, with help from fans all over the world adding to the story, giving a fictional character new life every day. You have said that Slender Man is the boogeyman.

Morgan and Anissa not only believed in Slender Man, they wanted to prove to the world he was real.

Morgan and Anissa not only believed in Slender Man, they wanted to prove to the world he was real.

As Slender Man's grip on these girls begins to reveal itself, back at the hospital, Peyton Leitner is unable to talk. At first, writing to communicate. One of her first questions is this.

As Slender Man's grip on these girls begins to reveal itself, back at the hospital, Peyton Leitner is unable to talk. At first, writing to communicate. One of her first questions is this.

When we come back, the girls now describe their original plan, why it changed, and who actually held the knife in the woods.

When we come back, the girls now describe their original plan, why it changed, and who actually held the knife in the woods.

Two mothers now trying to reconcile the little girls they raised with the 12 year olds who brutally attacked their friend.

Two mothers now trying to reconcile the little girls they raised with the 12 year olds who brutally attacked their friend.

And only now do moments along the way seem to carry greater weight. Morgan's mother telling me she remembers showing her daughter a movie, a children's classic.

And only now do moments along the way seem to carry greater weight. Morgan's mother telling me she remembers showing her daughter a movie, a children's classic.

And Anissa's mom points to her daughter's childhood and her struggle to fit in.

And Anissa's mom points to her daughter's childhood and her struggle to fit in.

Which is why both mothers say they were happy when their two daughters met at the bus stop in middle school.