Bonus | Girls Who Kill: On Psychopaths and Teens

Investigative reporter Matt Katz has been searching for his biological father since he was a little kid. But it wasn't until his 40s that he realized he was on the wrong journey altogether. The true story is wrapped in confusion and secrecy, and in the end it upended the truth about who he is – raising questions about identity, fatherhood, medical ethics and what family really means. But will finding answers make him whole, or just make things even more complicated? Inconceivable Truth is an 8-episode series with new episodes publishing Thursday mornings.

Justine and Holly ask an FBI profiler and a clinical psychologist their burning questions about Shelia and Rachel and the pathologies of juveniles who murder.

Morgantown attempts to heal. What, if anything, can be learned from the senseless murder of Skylar Neese?

Rachel and Shelia adjust to life behind bars. Ten years after her sentencing, Rachel comes up for parole. Will one of Skylar's killers go free?

Shelia and Rachel finally appear in court; Holly flies down to Morgantown to cover the proceedings.

As prosecutors build their case from Rachel's shocking confession, Shelia keeps up with her social calendar. Dave and Mary finally get some answers.

A last ditch effort to extract information from Shelia goes awry; Rachel returns to the scene of the crime.

It's a bleak Christmas for the Neeses, who go to extreme lengths to find their daughter. An examination of the past reveals warning signs.

As law enforcement circle Shelia and Rachel, a group of digital vigilantes begin to kick up dust. Officers learn more about the girls from their private journals.

July 6, 2012, the first day without Skylar, was complicated. After a strange summer, Shelia and Rachel return to University High School for their junior year.