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.