Ivy knows. She has recently become friends with Dawn Turner and after reading Dawn's latest blog update and how she was suspicious, Ivy decided to read Serenity's mind. She told Dawn that she knew the truth and the first chance she got, along with Angel and Dawn's boyfriend Lerk, they discussed what to do and how to handle the situation.
Pretending that nothing has changed, Ivy was on the couch watching a movie with Mason while talking in a whisper inaudible to human ears.
Ivy - Well like I said to your mother before,
I would do anything else I want to in order find out who this woman is.
Mason - And how do you plan to do that?
Ivy - I have an ability that not all of our kind do. When I bite someone it puts them into a highly suggestible trance like state, similar to if I were compelling them. Except its even stronger and compelling requires my concentration, where as this does not. It doesn't last long though, which is why while she is in this state, I will order her to take this drug I took from the hospital.
"Addy" - Ahh! IVY! What are you doing?
By the end of the question, her voice lulled and Serenity stared at Ivy emptily.
Ivy - There, now take this.
After she takes the "truth pill," Ivy sits Serenity down.
Ivy - Now, tell me your name.
Serenity - Serenity Maria Shepard.
Next, remembering Angel's theory she asked this.
Ivy - Who were you parents?
Serenity - Alexis Windfield and Adam McKnight the First.
Ivy - So then you are my mother's twin sister?
Serenity - Yes.
Ivy - Tell me why you're doing this.
Serenity - I'm working for a woman named Morgan, she requested it. I didn't want this, I was perfectly happy with the life I have.
Ivy - Why do what this woman wants?
Serenity - She says I owe her, that it's thanks to her I have the life that I'm so happy with. I knew the hard time my sister had as a child, friendless, written off as nothing, but a rich snob the second people heard the name Woodrow. And she was fatherless, but instead I was raised by a couple that loved me. Laura and Alexander Shepard were great parents to me and while they weren't rich as a nurse and a doctor they did make good enough money and I had good friends. Morgan says I have that life because of her, but Addy said what about the life I would have had if not for her. Yes, she grew up friendless, but she wouldn't have if she had had her twin sister, right?
Ivy - You don't want to do this anymore, do you?
Serenity - No. Doing this has giving me a taste of that life I would have had, has let me spend time with my mother, my brother, and my nieces and nephews; they are my family.
Ivy - If you don't want to do this anymore, then don't. Help, help mom, help us, Aunt Serenity.
Serenity - Awe, Ivy. I want to really, but...
Ivy - But?
Serenity - You don't know Morgan. I'm one of few people she actually likes and she would still most likely kill me if she knew I was even thinking of turning against her.
Ivy - You're afraid of her. I could make you afraid of me if I need to. We'll plan it out so that she wouldn't know you're involved until it's too late, and make sure nothing happens to you.
That night after Ivy filled Alissa in on the situation the two of them combined their power to try to sense Addy's location.