Rebecca Tolliver (Lois Smith) reports her 22-year-old daughter with Down Syndrome (Andrea Fay Friedman) is pregnant after being raped by her boyfriend (James Badge Dale). Detectives Benson and Stabler have to make sure it's not just her mother being overprotective and in denial of her daughter's sex life. They learn even more people could have used her innocence about sex to abuse her. ADA Cabot then has to interfere and take on her superior, to settle the mother