Pornographic photos from 15 year-old Savannah Biel's house party quickly circulate around her Tribeca high school and go viral. Barba's efforts to arrest the student responsible for posting the images is stalled when several suspects fall victim to a fast-moving measles outbreak. When Benson's foster son also catches the illness, she investigates a group of mothers who may have falsified their children's medical records. Meanwhile, Amaro receives some distressing news about his son.

Bayard Ellis takes on the case of a man incarcerated for incest and rape, whose daughter Michelle, the victim and star witness when she was a child, wants to recant her testimony and set her father free. When a judge refuses to reopen the 17 year old case, the SVU turns to retired Captain Cragen, who remembers the investigation and provides evidence that could change the convict's fate.