In this story the SVU squad is investigating three reported rapes with the same M/O and the victims are all successful professional women. What they have in common was a speed dating service and Mariska Hargitay goes undercover to nail the perpetrator.
What the squad comes up with is Dean Cain who is a surgeon and a domineering type of personality who doesn't like his women to question him in the slightest. All three victims dated him, but all three were raped by a man with a hooded mask. No identification and he has an alibi, a live-in girl friend played by Tina Holmes.
And Holmes is just a doormat of a personality, the kind who is not good at relationships, but she's fixated on Cain.
After this the story goes off in different directions as Holmes finally testifies for the prosecution in court and then attempts a suicide that leaves her a vegetable.
In the end we see what kind of master manipulator Cain truly is.
Cain's as evil as they come and for him you should see this SVU episode.