Rollins' sister makes a return visit, and this time she's battered and pregnant. When the situation escalates, Rollins resorts to dire actions, leading Internal Affairs to open up an investigation.

An FBI agent digs up one of the squad's cold cases, which she believes is linked to other cases across the nation. However, Benson and Amaro aren't confident that she has the right suspect.

Benson discovers that a death-row inmate (Mike Tyson) was the victim of a sexual predator, so she asks Bayard Ellis to reopen the prisoner's murder case.

An undercover investigation into savage attacks leads to a murder case, yet ADA Barba must tangle with a deceptively tough and cunning defense attorney in court.

Two suspects are tried for the same murder in separate, simultaneous court proceedings, with the DA in each case rushing for a conviction.

Fin's former brother-in-law gets arrested for assaulting a priest prior to Christmas, and Fin wants to help him by finding evidence that will vindicate him. As the detectives assist Fin, they uncover a hidden church scandal.

We're back! Happy 2013!

The detectives help the FBI by working with a prostitute from one of their old cases, hoping her link to a man on a killing rampage will prove useful.

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Claims of sexual abuse at an elite private school are investigated by the detectives, but their efforts are stalled by uncooperative school officials. A retired teacher then helps the police expose a huge cover-up involving even more victims

A baby is snatched from a playground by a woman who says she's the child's biological mom, and who claims that a powerful legal expert is the man who got her pregnant.