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.
As the investigation into a sex-for-housing scheme expands, 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.
Taylor becomes personally invested in having Bull help a dancer bring a civil suit against a real estate mogul who assaulted her at a gentlemen's club, when the district attorney's office refuses to pursue criminal charges.
Hannah is uncomfortable around her touchy-feely new boss; Shoshanna continues her quest to lose her virginity; trouble brews when Hannah's diary falls into the wrong hands.