A/N: Aren't you guys glad I'm getting better at updating? Lol.

So I was doing a re-read of the story to help me write this chapter and I noticed quite a few things that needed to be fixed. There was a typo in Chapter 1; I had the wrong date listed at the beginning of our flashbacks along with a few other things. So, I'm going back and editing Chapters 1, 2, and 3. You probably won't notice any major changes to the first two chapters, but there's a pretty big scene change in Chapter 3. So if you get alerts saying that there are multiple updates for this story, ignore them; I'm only posting an actual story update for Chapter 10.

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Mark Sloan hadn't been expecting to be attacked by his (ex) best friend when he got off of the elevators that day. Thankfully, Derek had only shoved him and punched him; there was now a nasty dent in the elevator. He didn't miss the dirty stares he got from nurses, attendings, and residents; apparently, whatever had transpired between Derek and Addison somehow involved him.

"What the hell are you people staring at? There are lives that need to be saved, now go on, get outta here!" Mark looked down; he was surprised to see Dr. Bailey taking the heat off of him.

"Dr. Bailey I-"

"Just…go get yourself cleaned up and then head to the chief's office Sloan," Bailey's voice was surprisingly kind as she spoke to him.

"Are you okay?" He looked to his left and saw that the new intern was still standing beside him. For a split second, he thought he saw concern in her eyes.

"You heard Shepherd, I'm bad news," Loren gave him a half smile.

"Well lucky for you I have nothing to worry about because I am not nor do I plan on sleeping with you," Mark smirked at her; somehow he knew that wouldn't last very long.

"What the hell did you do to Derek to piss him off? And look at your nose!" Callie Torres was now standing in front of him, reaching up to touch his nose, causing him to quickly swat her hand away.

"Ow!"

"It's more than likely broken; I can-"

"Oh no; you may be an Ortho god but I fix my own nose, got it? You can hold the mirror ; Rodriguez can watch," Callie and Loren rolled their eyes at him but followed him to a nearby exam room.

oOoOo

Derek sat in one of the chairs in front of Richard's desk looking like a child waiting on his punishment from the principle.

"I don't know what the hell possessed you to lose it in my hospital but-"

"Did you know that she was considering taking a job in Los Angeles?" Richard frowned.

"What the hell are you talking about? Who's thinking about taking a job in Los Angeles?"

"Addison," Even the way he said her name spelled contempt, causing Richard to sigh.

"No. I haven't heard anything about Addie supposedly considering a job in Los Angeles. And if she did, she'd be in breach of contract with the hospital, and that could get her sued…what the hell is going on between you two now Shep? When I saw you two this morning you were-"

"She said it wasn't a one night stand with Mark," Richard frowned.

"What?"

"Addison she, she'd probably been sleeping with Mark the entire time," Derek muttered just as Meredith stuck her head into the chief's office.

"What is it, Grey?"

"Dr. Bailey and Dr. Robbins wanted to know when Dr. Shepherd would-"

"Tell them Shepherd and Sloan are off the Jane Doe case," Derek's head whipped up to look at him.

"Richard-"

"Something tells me your little outburst with Sloan had everything to do with…I'm sorry Derek but I can't risk it. In fact, I'm considering having the case transferred from the hospital altogether. It's too much publicity and I can't have my head of neuro and my head of plastics trying to kill one another while my head of Neonatal has a nervous breakdown,"

"Chief…if I may; if you transfer Jane Doe to another hospital, she could die; her injuries are far too severe to move her now. Plus, the police are still investigating the case. I don't know what's going on with Dr. Shepherd, Dr. Sloan and Dr. Montgomery, but I do know that they're the best people to work on this case and putting anyone else on the case could end badly for Jane Doe," Derek turned and looked at Meredith as if she'd grown a third head; surprisingly, the chief agreed with Meredith.

"If you're not on the case already, but I want you monitoring this case round the clock, and make sure that Shepherd and Sloan don't kill each other," Meredith simply nodded before making her way out of the office.

"She knows; oh god she knows, Addison told her everything," Derek leaned forward, resting his elbows on his knees.

"Grey didn't seem like she knew anything to me…and why doesn't she know about your daughter? You two are dating aren't you?" The chief raised an eyebrow at him.

"I didn't…I don't talk about Abigail, ever; after you pulled her off the case, Meredith walked in on Addison crying and Addie said Abigail's name. Meredith asked me who she was but…" Derek sighed heavily, allowing his head to rest on his arms.

"Derek, you need to be honest with Meredith; I'm also assuming that you and Addie talked about Meredith knowing?"

"I tried but…that woman she's so…she told me about her and Mark out of spite," Richard gave Derek the side eye before inhaling deeply.

"Derek, Addison has a right to handle Abigail's disappearance, however, she wants to; you can't force her to pretend that her child doesn't exist because you're still hurting," Derek sighed heavily and looked up at his boss and longtime mentor.

"You're right I just…that Jane Doe case…"

"It hurts me too, Derek; Abigail was just as special to me as she was to you three,"

"You three?"

"You may not want to admit it but, Mark Sloan loved that little girl just as much as you and Addison, sometimes more,"

"Yeah, well why didn't his love for Abigail stop him from screwing my wife? It didn't stop me from finding them in my home in my bed in the throws of passion,"

New York, 2005

The first thing she feels is shock, followed by guilt and pain.

The moment she noticed Derek standing there, watching them, her heart sunk. This wasn't the way she wanted Derek to find out about them. Hell, she never wanted Derek to find out about them; she hadn't intended on sleeping with Mark tonight. It just happened.

"Addison…" Mark has already slid on his boxers and jeans.

"Can you go, please?" She can't even look at him right now; Mark sighs and pretends that her rejection doesn't sting.

"I'm here if you need me Red," When he tries to kiss her, she pulls away. Mark says nothing and heads downstairs. Derek is in the kitchen, staring at him with hatred and contempt. He watches as Mark slithers away like a snake, scooping up his jacket and shirt, mumbling an apology of sorts. Derek, of course, doesn't want to hear it; he doesn't bother looking back at him before heading upstairs to deal with Addison.

Addison is at least dressed, in a ratty old clash t-shirt; he isn't sure who it belongs to and frankly, he doesn't wanna know. The first thing he does is waltz right past her and into their closet, grabbing armfuls of her things.

"Derek, Derek, listen to me; you can't do this. Derek, we have to talk about this," Derek is ignoring her; he's too busy pulling the sheets, his favorite sheets to be exact, off the bed.

"No we don't," his voice is low and he's barely listening to her as she continues on with,

"You have to give me a chance to explain…Derek, what are you doing with my clothes?! Derek, it was one time!" She's following him out of the bedroom towards the staircase; neither one of them spares a glance at Abigail's now closed bedroom door.

"It was one time, I know that's what people say, that's what always gets said, it's just…I don't know how it happened. I don't even know what I was thinking; he was just, he was just-" Again, Derek doesn't buy that; he's too enraged to listen to anything she has to say. His main focus is getting down the front steps and to the front door.

"You screw my best friend and all you can say is 'he was just here'?!" He cannot believe this; he cannot believe the bullshit his wife, his wife of 11 years is spewing to him.

Now it all makes sense to him; why his mother almost insisted that he go home. She had known something like this was bound to happen. It makes him sick because he had every intention of going home to apologize, to make things right. Now, now he wants nothing to do with her; mother of his child be damned. He pulls open the front door and throws out her things, including the bedsheets.

"Get out," His voice is calm but menacing and she's standing there at the edge of the stair case a sobbing mess and defies him with the word,

"No," So, he says it again and of course she refuses.

"No, no, I'm not going; we have to talk about this…" somehow, her words become lost over his bellowing of

"Get out of my house, now!" She still refuses, anchors herself to the stair case and says,

"No, I'm holding my ground! I'm holding my ground; we don't quit, we have to work this out!" It becomes a struggle after that; words are shouted and screamed but it's vague. All he knows is that next, he is forcibly pulling her from the stairs as she cries,

"What are you doing?" he knows that her hands must be hurting, because he's got a tight grip on them and then her waist as he shoves her out the door; God, she must have splinters in her feet because she's literally being dragged out of the house. Her cries of 'no' are muffled once he shuts the door.

His hands rest on the panel surrounding the door; his breath is labored and heavy. He's even started to sweat a little; he's still wearing his cream-colored trench coat. She's sobbing, calling his name, begging to be let back in. It's still raining outside and their porch has very little covering. It's raining outside, she's only in a thing t-shirt that stops just above her thighs and it's got to be freezing. But Derek doesn't care because exactly 15 minutes ago he found her in his bed on top of his best friend fucking him into oblivion.

Time seems to stand still; he's not sure how long he lets her stay out there but his rational mind kicks in and tells him that soon enough she'll develop hypothermia and that they live in a very expensive neighborhood; someone is bound to see and hear something. They're already on the news for having a missing child. The last thing he needs to be is the guy who locked his wife out of the house while their child is missing. He slams a fist against the door before turning around; his breathing is heavy. He can feel the tears prickling in his eyes; the lump has already formed in his throat. He opens the door and she's standing there, tears stained from crying, her hair is frizzled and fuzzy from the rain and she's drenched thanks to the wind. She's sobbing, begging him about how sorry she is.

"I'm sorry you have to give me a chance; you have to give me a chance to show you how sorry I am," She sort of collapses into his arms. He allows her to lean against his chest, but he doesn't hug her back.

"I'm sorry okay," And when she tries to go in and kiss him, he pushes her away.

He can't imagine doing that, not now and not ever; especially after she'd just…she looks, hurt. He may be angry but he knows that she's hurt over him rejecting her when she's emotional. If the circumstances were different then he would, absolutely comfort her. But after what she'd just done…Derek runs a hand along his face, doing his best to swipe away any angry tears. He runs his hand back and through his hair as no one says anything.

"I'm gonna go, you stay; I'll get my clothes in the morning," He doesn't know what possesses him to say it but he does. He cannot stay here with her, not a second longer.

"No, no, no, no; we can survive this. Derek, we can survive this; we're…we're Addison-and-Derek," And there it is, that stupid way that their names had become one over the years; Addison-and-Derek. It was cute at first but as the years passed, so did the name's cuteness.

"I can't look at you; I look at you and I feel nauseous I just…w-w-w-we're not Derek-and-Addison anymore," And even though he's hurting, even though he hates her fucking guts, he cannot let go of the way he's supposed to automatically changes their names around to annoy her.

"If you go now if you go now, we are not gonna get through this. If you go now, we don't have a chance. We don't have a chance if you go now if you go…" He stands there and looks at her long, hard and painfully, all he can see is Abigail. And seeing her face in the eyes of the woman he'd loved for nearly 15 years after she'd just fucked his best friend was too much for him to handle.

Derek promptly turns around and walks away, slamming the door behind him.

Seattle:

Dr. Bailey finds her on the cat walk, staring out at the people as they come and go into the hospital. She's known Addison Forbes Montgomery Shepherd for quite some time now and likes to consider them as friends of some sort. They sort of have to be friends or at least friend if they've both examined one another's vagina's and Addison has drunkenly cried over finding Meredith's panties in her husband's coat pocket.

"I learned a very interesting thing today," Dr. Bailey matches Addison's stance, though Addison says nothing.

"I why the chief pulled you off the Jane Doe case," Addison says nothing. Bailey tries again because she looks like she could use a friend; someone who's not going to judge her.

"I…I know about your daughter," Addison is silent for a full five minutes before responding,

"Did Meredith Grey tell you that?"

"No; Mark Sloan accidentally let it slip in the scrub room," Addison scoffs, shakes her head but remains face forward.

"I can't begin to imagine-"

"It's been two years, he's been with her nearly two years and she didn't even know," Dr. Bailey moves closer to Addison, almost unable to hear what she said.

"I beg your pardon?"

"I said, our daughter has been missing for almost two years and the first time Meredith heard about her was when she heard me crying in an on-call room," Dr. Bailey's eyes widen, though she quickly schools her face into something more serious.

"Shepherd didn't-"

"For whatever reason, he kept her a secret from Meredith, from everyone here. It's like she never even existed to him," Addison shakes her head, wiping away a stray tear.

"Do you mind if I ask-"

"Our marriage had been wrong for quite some time; long before Mark and I happened and long before Abigail went missing. If I'm honest, I'd say our problems began when I got pregnant with her. We were still young; only 31 and barely done with our residencies. I was doing a double fellowship when I found out and Derek well, he was itching to be chief of surgery someday. We talked about it, about aborting but, in the end since we both agreed that we wanted kids, we decided to keep her. I mean, our best friends Sam and Naomi had somehow managed to successfully raise a child while residents so we thought, or well I thought, why the hell not? I was wrong, I was extremely wrong…" Bailey watches as Addison's hands clench and unclench against the rails; she says nothing, only waits for Addison to continue.

"Abigail was born four days before Halloween in 2000, just two weeks after I'd turned 32. I'd always been skeptical of good of a parent I'd be but…the minute I held her in my arms…"

"You knew huh?" Bailey finally sees a smile on her face, though it doesn't last.

"I was in love with her but Derek? He took a little longer to warm up to the idea. I won't say he didn't love her he just…had a harder time accepting the fact that he was a dad. We argued about everything after that; whether or not she should be baptized or not; he's Catholic and I'm Protestant, though I don't necessarily believe in God in the religious sense and I only go to church on Christmas and he only goes out of obligation for his mother's sake. We argued about bottle feeding versus breast feeding, whether or not we should get a nanny or send her to daycare…I obviously won on the nanny part; daycare seemed so…"

"Beneath you?" Bailey raises an eyebrow as Addison has the decency to cringe a little.

"Not exactly; anywho, I made sacrifices for my career, I worked less hours at the hospital because I wanted to be with Abigail as much as possible. A lot of people expected me to drop my surgical specialty but I was determined. If it meant that I walked around the hospital with a baby on my hip then I did it. Derek was…less hands-on, which is ironic considering he comes from a family where all they seem to do is have babies. The first year was rough but, somehow we made it and things seemed to be okay. We had a system, or rather, I had a system going and Derek just sort of followed along. There were times when I thought we made a perfect little family but, he always crushed my hopes by failing to show up or forgetting holidays, birthdays, anniversaries; mostly anything to do with me he missed,"

"Is this how you ended up with Sloan?" She hates to press but, the story of Addison, Mark, and Derek is compelling, interesting, and all out messy.

"Mark was always there and I knew he'd had a crush on me since med school. He wanted everything Derek had; love, family, a wife. I know it sounds ridiculous but, I've spent more time talking to Mark Sloan than sleeping with him. He's not a bad guy underneath the surface…it's sort of why I fell in love with him, or, well, at least I thought I did,"

"So you and Mark were-"

"We had been together a few months before Abigail disappeared and after Derek caught us we lived together for about two months," Addison hangs her head in shame, obviously not proud of what she'd done.

"What exactly happened to your daughter, if you don't mind me asking?" Addison takes a deep breath and closes her eyes for a moment; Bailey reaches over and squeezes her hand.

"If you don't wanna talk about it-"

"It was the beginning of October; Abby was in ballet and she had a recital that night. Derek of course was a no-show for the performance but managed to show up after we went to dinner. She was so happy to see him; he'd worked nonstop that week. We took her home, put her to bed and we argued. I mentioned wanting to leave and he just…for a moment I saw the man I'd married. We had sex that night and I woke up when I heard someone downstairs. Derek went downstairs while I called the police. I went to Abigail's room to protect her but…the men who broke into our house, they came into her room. I made her hide in the closet and told her not to come out until Derek or I told her it was safe. The last thing I remember is begging them not to hurt her. When I woke up, I found out that they'd attacked both Derek and I and took Abigail,"

"Did the police ever establish motive?"

"They tried, asked us thousands of questions; who could possibly want to hurt us. They interviewed everyone in our family, our friends, people we worked with…"

"How did you two end up here?"

"Derek caught Mark and I in bed together a week after she disappeared. We'd been staying at his mother's house and she wasn't…Carolyn Shepherd didn't like the fact that I'd been holed up in a room since my daughter had gone missing,"

"What?"

"She was never a big fan of mine anyways; I overheard she and Derek talking about what happened and I left. Mark took me home and, well, you know the rest…"

"Shepherd came home, caught you two in bed together," Addison nods.

"And you know, the craziest thing is that when he caught us, he didn't say anything; he just walked away. Once Mark was gone he really let me have it; he took my things out of the closet, tossed them onto the front steps and then physically removed me from our house," Bailey's eyes widened; she never imagined Derek Shepherd to be that kind of man.

"He eventually let me back in but, he left that night and I didn't see him again until I was standing right down there learning about his girlfriend," Addison's hand points down to the entry way of the hospital. Though she wasn't there to witness it, she heard that Addison Montgomery made quite the entrance.

"What about your daughter's case now? Have you two-"

"I did, for a while; I would call the detectives and ask for updates but…the case went cold after six months so, I stopped calling. Of course, there were leads that turned out to be dead ends; they tried contacting me but, I changed my number and never looked back," Bailey is still holding Addison's hand by the time she's done talking.

"I can't imagine that Jane Doe case being easy for you,"

"It wasn't; I miss her, every single day, but I've given up hope of ever finding her alive," Addison sniffles, taking in a deep breath; for the first time since they began talking, she turns to face Bailey.

"Thank you, for listening, Miranda," There's a wet smile that Bailey instantly returns.

"Anytime, and if you ever wanna talk-"

"Actually, I'd prefer it if you kept this to yourself," Bailey nods.

"Of course, of course; your secret's safe with me," Out of the corner of her eye, she spots Meredith Grey.

"Yes, Dr. Grey can I help you?" Meredith looks apprehensive, though her eyes are trained on Addison.

"Dr. Montgomery?"

"Yes, Dr. Grey?"

"The chief wanted me to inform you that you're back on the Jane Doe case," Addison's eyes widen in surprise.

"He, he did?" Meredith nods.

"And what does that have to do with you, Grey?"

"The chief assigned me to the case, says I'm responsible for making sure Dr. Shepherd and Dr. Sloan don't kill one another,"

"Well Grey you can tell the chief that I won't be taking the case; I'm actually going out of town for a few days," Meredith and Dr. Bailey look at Addison as if she's grown a third head.

"You're leaving?"

"Yes, well…possibly; I'm going to Los Angeles to see some old friends for a few days,"

"But what about-"

"If the case gets serious I'll be on the first flight back to Seattle," Bailey gives Addison a knowing look which causes her to smile.

"But the Jane Doe case-"

"From what Dr. Rodriguez told me, she needs Dr. Shepherd and Dr. Sloan's help way more than she needs mine right now. Now, if you'll excuse me, I've gotta go see Richard about my travel plans," Addison gives Bailey and Meredith a smile before walking away.

Chapter 11 to follow…

So, Addison is going to be exiting the story for a little bit. We may check in on her in Los Angeles but I can't be sure. Things are going to start moving a bit quickly in the coming chapters; we're getting ready to wind things down soon. I'm so glad you guys are loving and enjoying this story!

Stay tuned for the next chapter!

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