An underage girl disappears after following her older sister to a college party in Manhattan. The SVU detectives mobilize to recover the missing girl but find themselves thwarted by a high-tech kidnapper using the internet to cover his tracks. As the case hits a dead end, DA Barba returns with some unlikely help. Meanwhile, Rollins is distracted by the sudden appearance of her very troubled sister.

Professor's unusual encounter with Detective Amaro sends the SVU on an investigation into reports of sexual abuse at a prestigious private school. Stonewalled by the school board, Detective Benson enlists ADA Barba and a retired teacher to help reveal a massive cover-up as more and more victims emerge.