When Harper Anderson (played incredibly well by Tracy Pollan) is raped, Olivia is the first detective to come to her aid and help her out, mostly emotionally. Even though she is able to recount nearly every detail of what happened, she ends up freezing up and is unable to pick him out of the line-up. Six months go by and Olivia and Elliot learn from Harper's boyfriend that she has moved, quit her job and has broken up with him. Another woman, around Harper's age then comes forward and tells the detectives she has been raped; and the details are practically identical to what happened to Harper. When Olivia and Elliot finally find Harper, they ask her to try and remember the man's voice (since her eyes were covered) but she refuses and the perp is not captured. This was actually the first part of a two part episode; the second part aired in season two.
This was a great episode. I loved how Olivia believed that Harper truly was raped, even though some of the evidence suggest that she made it up. And of course there is the beginning of the episode when we find Olivia and Brian in bed together. The fact that this was basically a "to be continued" episode made it even better. I won't give away what happens in that episode here. All in all, great writing, acting and great episode!