Law & Order: Special Victims Unit: Season 12, Episode 20

Totem

Sex therapist, Cap Jackson (Jeremy Irons) returns to work with Detectives Benson and Stabler when a young girl is found brutally murdered. The girl is found stuffed into a suitcase and the murderer comes down pressuring her piano teacher (Elizabeth Mitchell) taking the fall for her sister. The piano teacher's mother (Lisa Banes) was the one who sexually abused the sisters. The piano teacher's sister (Agatha Nowicki) suffocated the child when she accidentally came to her piano class when it was cancelled.