The body of a girl is found in a suitcase along with a doll. Despite statistics to the contrary, sex therapist-turned-consultant Cap Jackson (played by Jeremy Irons) thinks the killer is a woman. After getting a confession from the child's piano teacher, Benson and Stabler learn shocking details about her mother and sister. We're talking about Special Victims Unit season 12 episode 20 "Totem." Our returning guest is Irish broadcaster Chris Greene.Plot points for this episode are taken from the 2009 murder of Sandra Cantu.