The SVU squad gets a psychologist consultant when B.D. Wong is away on assignment. It's Mary Stuart Masterson who would repeat her role as Dr. Rebecca Hendrux on several more episodes.
A rapist starts working a certain neighborhood and targeting the most vulnerable, people with disabilities of some kind. His fifth victim ends up a homicide.
Where Masterson becomes necessary is with the fourth victim, schizophrenic played by Amanda Plummer. Plummer gets to really chew the scenery, but the role does call for it.
In the end forensics and a little detective work by Christopher Meloni nails the suspect who is not one you would normally think of as raping women. In fact Masterson is a former cop, but who quit the force for medicine. She and Mariska Hargitay went to the academy together, but she gets a better rapport with Meloni.
Interesting how the perpetrator was brought to justice in this episode.