When a young woman finds a teenage boy asleep and naked in her bedroom, his mother, Bree Walsh, is quick to defend him. While Detective Benson and Detective Stabler try to figure out what truly happened, they also have to manage the sneaky teenager and his naive mother. As the detectives dig deeper, they discover how deceptive appearances can be.

Detective Benson calls on Bayard Ellis for legal help when her estranged brother gets caught in a child custody battle. Also, Detectives Tutuola and Rollins investigate why a newborn baby is abandoned near a hospital.

As the SVU detectives investigate the alleged rape of a sorority pledge, drunken students, and conflicting accounts complicate matters.

Amaro suspects the boyfriend of a missing girl is involved with a gang; Benson becomes the SVU's new sergeant.

A measles outbreak delays arrests in a case involving pornographic photos taken by teens at a party. Meanwhile, Benson discovers that some kids' medical records may have been falsified after Noah gets measles; Amaro leans upsetting news about his son.