
Mask
Debbie Shields comes home to find her partner Ann Jackson being raped by a man wearing a haunting mask. Shields contacts Ann's father to notify him of her critical condition. As detectives Benson and Stabler interrogate Ann's father, Captain Jackson, his sordid past is revealed filled with sexual and alcohol addiction. Jackson's new role as a sex therapist is hindering the detectives from getting the information they need to solve the case and if Jackson won't comply, the detectives are going to have to get creative.
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More from this season

S12 E1
Locum
Benson and Stabler are called to investigate when a little girl goes missing. They soon find out that the mother had another daughter who disappeared some years earlier and she becomes the focus of the investigation.

S12 E2
Bullseye
The brutal rape of a ten-year-old girl leaves her unable to recall her own name. Unfortunately, once Fin assists with the ID, the detectives find that she's not the only one with memory impairment, and Dr. Huang is brought in to assess her home situation.

S12 E3
Behave
A woman who has been raped multiple times is afraid to leave her house. The issue of unopened rape kits will see Detective Olivia Benson travel from New York City to Los Angeles.

S12 E4
Merchandise
A teenage girl's death exposes a human trafficking ring and leads detectives Olivia Benson and Elliot Stabler to team up with an old friend at the U.S. Attorney's office.