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We have been there for the journey. Two different mothers, now visiting their daughters, locked up since they were 12.

Christy Weier, her daughter, is Anissa.

Christy Weier, her daughter, is Anissa.

Angie Geiser's daughter Morgan, who came up with the plan and who held the knife.

Angie Geiser's daughter Morgan, who came up with the plan and who held the knife.

Their daughters are now teenagers. Anissa is 16. Morgan is 15. They have spent countless hours driving to visit their daughters locked up, trying to wrap their heads around how their two little girls, just 12 years old at the time, could have done something so unimaginable. And all of it began that Friday night. What was the plan for that night?

Their daughters are now teenagers. Anissa is 16. Morgan is 15. They have spent countless hours driving to visit their daughters locked up, trying to wrap their heads around how their two little girls, just 12 years old at the time, could have done something so unimaginable. And all of it began that Friday night. What was the plan for that night?

And the third girl who was with them, Peyton Lightner, also just 12. Stacey and Joe Lightner remember their daughter had been looking forward to it for weeks. You remember how excited she was that Friday afternoon?

And the third girl who was with them, Peyton Lightner, also just 12. Stacey and Joe Lightner remember their daughter had been looking forward to it for weeks. You remember how excited she was that Friday afternoon?

Blindsided by what those two friends had in store. And they'd been planning it for months. After that night of skating, they would return to Morgan's house. Morgan's mother, Angie, downstairs.

Blindsided by what those two friends had in store. And they'd been planning it for months. After that night of skating, they would return to Morgan's house. Morgan's mother, Angie, downstairs.

The first sign anything is wrong, a police officer showing up at Angie's door.

The first sign anything is wrong, a police officer showing up at Angie's door.

Across town, officers are also arriving at Peyton's house.

Across town, officers are also arriving at Peyton's house.

Angie Geiser says the police tell her that Morgan is missing. They think she may be hiding her daughter.

Angie Geiser says the police tell her that Morgan is missing. They think she may be hiding her daughter.

At first, police refusing to reveal which one of those girls was hurt. They quickly also tracked down the parents of the third friend, Anissa Wire, telling them their daughter is missing too.

At first, police refusing to reveal which one of those girls was hurt. They quickly also tracked down the parents of the third friend, Anissa Wire, telling them their daughter is missing too.

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.