When a 16 year old girl is found attacked in a stairwell, she is rushed to the ER. It is up to Benson and Stabler to identify the girl. They find out that she is the step-daughter of Judge Thornburg, one of the city's most respected judges. When the Detectives discover that Tricia was writing to inmates that her step-father put away, they begin to suspect a recent parolee. After digging into Tricia's life, they find that there is a family secret that she was willing to kill her step-father over.
This was a great episode. While watching it you are convinced that Tricia is a problem child who was just out to upset her parents, but then you really find that she was abused and lashing out as a cry for help.