The squad spends New Year's Eve tracking down an Amber Alert, and Carisi faces off against Counselor Rafael Barba in an emotional courtroom battle.

While Fin and Phoebe make wedding plans, Benson and Rollins try to help a homeless single mother who’s being trafficked in exchange for safe housing.

Benson's loyalty to Garland is tested. Rollins and Carisi try to keep their witnesses on board when a powerful congressman is identified as a suspect.

The search for a missing witness leads Fin and Kat down a dangerous path. Chief McGrath puts pressure on Garland and Benson to get a conviction.