Plot Synopsis

With the help of an on-camera expert psychologist, victims provide first-hand accounts of their experiences with con artists, highlighting their betrayals, double lives and psychological profiles and exposing the tell-tale signs, trends and schemes of the men and women who have wreaked havoc on their lives. Investigation Discovery aired the U.S. premiere of this series on Wednesday, June 15, 2011 at 10pm ET with back-to-back episodes.
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THE DEVIL YOU KNOW returned for its third season on Investigation Discovery on Thursday, November 7, 2013 at 10pm ET/PT, with back-to-back episodes featuring stories about: Melissa Fountain, who has doubts about her devoted husband when women are attacked on the streets of Ocala, FL, and Alayne Katz, who believes the culprit responsible for her sister's disappearance is close to home.