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It would take hours to piece together exactly what happened at that birthday sleepover. The first moment anyone would begin to learn of the horror is this call to 911.

12-year-old Peyton Lightner had just crawled out of the woods covered in blood, stabbed 19 times. And you can hear it in their voices. The operators cannot believe what they are hearing.

12-year-old Peyton Lightner had just crawled out of the woods covered in blood, stabbed 19 times. And you can hear it in their voices. The operators cannot believe what they are hearing.

Greg Steinberg was riding his bike that morning on a path that had actually been chained off. It was pure chance he came this way.

Greg Steinberg was riding his bike that morning on a path that had actually been chained off. It was pure chance he came this way.

He watches as the ambulance rushes her away. And when you looked at her, it was immediately apparent she'd been stabbed multiple times.

He watches as the ambulance rushes her away. And when you looked at her, it was immediately apparent she'd been stabbed multiple times.

Doctors fear she might not survive, and her mother, Stacy, has just been told that Peyton has been rushed to the hospital.

Doctors fear she might not survive, and her mother, Stacy, has just been told that Peyton has been rushed to the hospital.

There were so many stab wounds, it took two nurses to count them, 19 in all. And her little girl is now being raced down the hall.

There were so many stab wounds, it took two nurses to count them, 19 in all. And her little girl is now being raced down the hall.

Peyton's mother could not believe that her daughter's friend could be capable of this.

Peyton's mother could not believe that her daughter's friend could be capable of this.

But that's exactly what investigators were telling Morgan's mother, that her daughter and Anissa Wire had stabbed their friend multiple times, and now both girls were nowhere to be found.

But that's exactly what investigators were telling Morgan's mother, that her daughter and Anissa Wire had stabbed their friend multiple times, and now both girls were nowhere to be found.

When we come back, the doctors discover it is worse than anyone thought. And we're with the surgeon who saves Peyton. It's less than a millimeter between living and dying. Yes. And where investigators would discover those girls, they would reveal in their own words why they did this. The stunning interrogations.

When we come back, the doctors discover it is worse than anyone thought. And we're with the surgeon who saves Peyton. It's less than a millimeter between living and dying. Yes. And where investigators would discover those girls, they would reveal in their own words why they did this. The stunning interrogations.

It was like looking at a different child?

It was like looking at a different child?

But it was her daughter and what they would discover that had been hidden from that mother for years when we come back.