Strap in, it's the annual Valentine's Day episode! Crimes involving folie à deux are the gifts that keep on giving, and this episode focuses on more than 2 people being in on the delusion. 

First, Anna goes down the list of how people can develop such shared delusions, and Benton tells the tragic tale of the mass suicide of the Chundawat family. Then, Anna recounts the case of three sisters who fed into each other's religious fanaticism. Finally, the two watch an episode of Forensic Files, profiling the notorious BJ and Erika Sifrit.

Our TV doc this week is Season 13: Episode 47 of Forensic Files, "Dirty Little Secret".