Christa Richello is convinced Chris Watts is innocent and is writing a book with him and her now-fiancé, Dylan; Christa delves into her relationship with the two men and Cheryln Cadle reveals information the FBI don't even know.

Shayna Hubers shot and killed her boyfriend, Ryan Poston; now Holly Nivens details how Shayna manipulated her into believing it was self-defense; Cecily Miller details Shayna's behaviour after her arrest; Carissa details how Ryan wanted out.

Susan was convicted of killing her two sons; now her cellmates are revealing all, including how they helped her procure drugs and kept her sexual relationships a secret; Alfred and Elizabeth Rowe detail Alfred's inappropriate encounters with Susan.

In 2008, Casey Anthony was charged with first degree murder for the disappearance of her daughter, Caylee. In new interviews, Casey's former jail mate, Robyn Adams reveals how the two forged a deep friendship through hundreds of letters and secret meet-ups behind jail walls. Through the evolution of their friendship, she begins to notice red flags and realizes that Casey may actually be the person everyone warned her about. Plus, prison guard Silvia Hernandez reveals how meeting Casey wreaked havoc on her life.

In 2007, Drew Peterson was charged with murdering his third wife, Kathleen; new interviews with Drew's girlfriend, Nicole Speakman.

A former prison staffer named Joyce Mitchell helped two convicts escape from Dannemora prison in NY; Erik Jensen reveals the tactics that inmates used to convince Joyce to help them escape.