Parents Andy and Bridget received a call from a scammer who claimed he was holding their daughter hostage for ransom; Debra, the real woman behind the podcast and Bravo series "Dirty John," tells of meeting a dangerous criminal online.

Cheryl's and Jane's two children disappeared without a trace within a month of each other, before Di's son was shot and killed. Di says her son told her something cryptic two weeks before he died.