In part 1 of this two-part episode, Caroline tells Jane about the disappearance of Kala Brown and her boyfriend Charlie Carver. After Kala and Charlie go missing, the police use cell phone data to track their last whereabouts to the massive property of Todd Kohlhepp, but what police find on Todd's land is something more sinister than they ever could have imagined.

Sources:

Serial Killer: Devil Unchained Episodes 1-3, Investigate Discovery

https://abcnews.go.com/US/todd-kohlhepps-confession-2003-murders-south-carolina/story?id=43358913

https://www.cbsnews.com/news/todd-kohlhepp-case-48-hours-confessions-of-a-suspected-serial-killer-buried-truth/

https://www.greenvilleonline.com/story/news/crime/2016/11/12/driven-anger/93548938/

https://www.greenvilleonline.com/story/news/local/2016/11/04/missing-how-anderson-couples-case-unfolded/93302680/

https://web.archive.org/web/20180108125807/http://wbtw.com/2016/11/04/court-documents-at-15-years-old-kohlhepp-tied-up-14-year-old-sexually-assaulted-her/

https://www.wwlp.com/news/todd-kohlhepp-accused-kidnapper-of-woman-found-chained-like-dog/

https://www.cbsnews.com/news/todd-kohlhepp-south-carolina-who-is-suspected-serial-killer/

https://www.vizaca.com/kala-brown-kidnapping-survivor/

http://web.archive.org/web/20161107133827/https://abcnews.go.com/US/wireStory/sheriff-man-killed-confesses-2003-slayings-43336516

https://www.foxcarolina.com/news/more-items-belonging-to-convicted-serial-killer-kohlhepp-going-to-auction/article_d2fbd864-d39d-11ea-9df8-d30101b3026d.html

https://www.investigationdiscovery.com/crimefeed/serial-killer/serial-killer-todd-kohlhepp-claims-2-more-south-carolina-murders

https://edition.cnn.com/2017/05/26/us/south-carolina-kohlhepp-guilty-plea/

https://www.nbcnews.com/news/us-news/south-carolina-serial-killer-todd-kohlhepp-pleads-guilty-7-murders-n765091

https://www.usatoday.com/story/news/nation-now/2016/11/08/todd-kohlhepp-acquire-guns/93505174/

https://www.thepublicopinion.com/story/news/2018/09/03/eminem-references-todd-kohlhepp-survivor-kala-brown-with-a-clever-line-on-new-album/44565679/

https://www.cbsnews.com/news/serial-killer-todd-kohlhepp-claims-2-more-victims-buried-in-south-carolina/

https://www.cnn.com/2016/11/10/us/south-carolina-kohlhepp-cold-case-killings/index.html

https://www.nytimes.com/2016/11/10/us/south-carolina-identifies-bodies-found-on-suspects-property.html