Law and Order SVU 16×15 “Undercover Mother” – Working undercover to bust a sex trafficking ring, Det. Carisi (Peter Scanavino) stumbles upon Martha Thornhill (guest star Lili Taylor), a mother who has embedded herself as a Madame in the organization for three years in hopes of finding and saving her daughter, Ariel. Martha joins forces with the SVU and they work together to bust the pimp and his cohorts, but Ariel is still missing. Meanwhile, Sgt. Benson (Mariska Hargitay) is confronted with a harsh revelation that will change her life forever. Also starring Ice-T (Det. Odafin Tutuola), Danny Pino (Det. Nick Amaro), Kelli Giddish (Det. Amanda Rollins) and Raúl Esparza (ADA Rafael Barba). Guest starring Danielle Burgess (Nina Soren), Amanda Warren (Tracy), Justin McCarthy (Tommy Strickland) and Tamara Tunie (M.E. Melinda Warner).