Aderyn took a deep breath, holding the screwdriver out in front of her, she pressed the button, changed a few settings then pressed it again. The crack opened wide. Beyond it they could see a vast beach.

"Where is that?" Amy asked, peering around the door frame.

"Bad Wolf Bay." the Doctor said. In the distance they could see two people stood facing them.

"The door is open," Aderyn said quietly "We're wasting time stood here." But she didn't move. Fear and apprehension kept her rooted to the spot. She was thinking that this had been a really bad idea when she felt fingers curl around her hand. She looked down at her hand, then up at the Doctor "Come on," he said, giving her hand a reassuring squeeze "If you knew time like I do, you wouldn't talk about wasting it." She looked round at River who gave her a comforting smile.

"Allons-y." Aderyn whispered as they walked through the crack, Aderyn could tell that the Doctor was as scared as she was. He had often told her about adventures he had been on with a woman named Rose, gone into great details about what they had been up to, well to a certain extent anyway. And she could tell he had loved her. But she never would have guessed that the woman was her mother, never guessed that the woman who's adventures with the Doctor she had written about, was her own mother. The fact she had found out a few weeks ago meant nothing. It had all felt like a dream. Now, walking along the sand towards Rose Tyler, the dream was suddenly very real.

Rose Tyler wasn't alone. Aderyn recognised the man she was with. It was a previous regeneration of the Doctor, the regeneration she had first met all those years ago. She had been told that there was a copy of him somewhere, but seeing him stood in front of her was, perhaps, the least surreal part of the day so far.

"The TARDIS told us you would be here." Rose said as they approached. There was an awkward silence. No one knew how best to approach a conversation. The Duplicate Doctor broke the tension, he extended a hand to River "You must be River Song," he said, shaking River's hand "Though I'm not sure whether it's Doctor or Professor. I don't know whereabouts in your time stream you are."

"It's Professor now." River said.

The Duplicate Doctor smiled happily at her "Fantastic." Aderyn looked from Rose to the Doctor, then to the Duplicate.

"We'll leave them to catch up a bit." The Duplicate said.

Aderyn, River and the Duplicate sidled away from them.

"You lied to me," the Doctor said when the others were out of earshot "You told me it was your mum that was pregnant."

"I'm sorry," Rose said "I knew that if I told you the truth then you would have torn both universes apart just to get to me."

"You're right I would have." the Doctor interjected.

"But I couldn't let you do that. That would have destroyed the universe and that's not what you do. You save the universe, you protect it."

The Doctor shifted his feet, digging into the sand with the heel of his shoe "I could have helped. Maybe if I was there then nobody would have been after her. Who was after her?"

Rose tucked her hair behind her ears. The Doctor had forgotten how much he found that small gesture so charming and adorable.

"I don't know and I don't know why. But you see, Doctor, Aderyn needed to be in your universe. She's destined for big things that she still has to do. She had to go through all that hell when she was younger to become the person she needs to be. It wasn't easy for me. Lying to you, giving up my only child. They were the hardest things I've ever had to do. I would rather have taken on the Daleks again then go through that."

They fell into an awkward silence, which was eventually broken by Rose "So you regenerated then?"

"Yeah. I fancied a change." The Doctor laughed awkwardly.

"Bow ties are cool." Rose smiled, reaching out and straightening the Doctor's bow tie.

"I tell people that but the only one that believes me is Aderyn." The Doctor said shyly.

"I bet she's like you. Funny, too smart for her own good, always looking out for other people."

"Yes she is that. But she reminds me of your mum sometimes. She slaps me. Proper clip round the back of the head," The Doctor smiled. This time the laughter wasn't as awkward. The Doctor had to admit he had really missed Rose. "Now she's regenerated she looks like him." The Doctor pointed at the Duplicate, who was laughing with River and Aderyn.

"She looks like you then."

"Is that really what the Doctor looks like now? All floppy hair and elbow patches?" The Duplicate asked. He surveyed the Doctor with a certain amount of distaste.

"Unfortunately yes. He has a bit of a liking for fezzes for some reason as well." Aderyn said.

"And he's casually wearing a bow tie. Who does that?" The Duplicate says in disbelief.

"He does." Aderyn said.

"So do you." River muttered.

"Bow ties are cool." Aderyn said defensively.

The Duplicate stared at her with a mixture of surprise and amusement. But this faded. He gave her a very serious expression "Look, I know it wasn't pleasant for you growing up the way you did. But you are destined for something so much greater then anything you've done so far."

"How do you know that? How do you know so much about my future?" Aderyn said, sounding angrier then she intended.

The Duplicate looked over at Rose to make sure she couldn't hear them "I'm meant to say spoilers. There's very little, well practically nothing, that I can tell you. But I will tell you we had a tip off. Well, I say tip off " He scratched the back of his head the way he always used to when he was nervous or thinking. "We pretty much got told everything that was going to happen to you. Time can be rewritten, but not fixed points. And a lot of the things in your future are fixed points."

He looked up at River, who had been staying quiet as they'd spoken. He, rightly, guessed that she was there more for moral support then anything else. "So where about in your time stream are you two now?"

Aderyn showed him the ring on the chain. It was white gold studded with brilliant blue sapphires.

"That is just brilliant," He said excitedly. "And look, it's the TARDIS colours."

"If you know so much about my future, about who I am, then could you tell me why my time stream is so screwed up?" Aderyn asked. The Duplicate scratched the back of his head again.

"I'm not sure whether I can tell you that. I'll have to run that one passed the missus."

"Speaking of which." River nodded in the direction of Rose and the Doctor. They were watching them.

When they rejoined Rose and the Doctor it was obvious that something had been cleared up between them, though some tension and awkwardness still remained.

"I'm sorry," Rose said to Aderyn "I didn't know what else to do."

"I know," Aderyn said "Fixed points and all that."

Rose smiled sadly at her "That wasn't a fixed point. The fixed points are there because we sent you to the other universe. We did find out what happened to you. But only what happened if you weren't here. But you were never meant to leave."

"Then why did I?" Aderyn asked quietly.

"Because of what would have happen if you didn't." Rose replied.

"What would have happen?"

"Spoilers." Rose said.

Aderyn sighed "Dear God I am so fed up of hearing that."

Rose reached into her bag, taking out two TARDIS blue diaries "I'm not sure how they ended up here. But they did. They're both full. Not a blank page in either. So we knew what would happen."

The Duplicate leant closer to Rose and whispered conspiratorially in her ear. Rose smiled and nodded.

"Ok," The Duplicate said, clapping his hands then rubbing them together "The screwed up time stream."

"Yes why is that?" Aderyn asked.

"You have two time streams. As Rose said you were never meant to leave Bad Wolf Bay. So one time stream developed and kept on as though you were here. That's why you remembered what happened in America," The Duplicate said cheerfully "But it saved your life. When the Pandorica closed you didn't die like everything else in that chamber because your time streams switched. And that's why having Oswin in your time stream made no difference. Brilliant isn't it?" He smiled.

"Brilliant but complicated." River said.

"Everything about me is complicated," Aderyn said. She frowned at the Duplicate "And I can't quite figure out whether you're lying or hiding information from me," the Duplicate opened his to talk but Aderyn raised her hand "If you're about to say spoilers then please don't." The Duplicate closed his mouth then smiled at her.

The scanner in Aderyn's pocket let out a beep. She looked at it "It's a countdown from the TARDIS. We only have a couple of minutes."

"We should head back." River said. Aderyn nodded at her.

River extended her hand to Rose then the Duplicate "It was nice to meet you both. But I better go and put the kettle on." She walked away from them. River was reluctant to leave without knowing that Aderyn was ok, but she needed her time to say goodbye.

"We should go too." The Doctor said. He was as reluctant to leave as River, but he knew he couldn't get stuck here.

"Good luck with everything." The Duplicate said.

"Yeah, you too." The Doctor replied. Rose hugged him. And for a moment, he didn't want to let her go.

"Look after her Doctor." Rose whispered to him.

"You know I will." The Doctor whispered back. When the Doctor let her go, Rose turned to Aderyn. She had tears streaming down her face and Aderyn had to fight back tears of her own.

"You be good," Rose said "And remember that you were always wanted. No matter what anyone ever tells you, you are always wanted." When Rose hugged her, Aderyn could no longer hold back the tears. When Rose let her go she wiped Aderyn's eyes with the sleeve of her jacket.

"I will tell you this much though," She said "There are going to be times when you'll have more fun then you think is possible. Better days are coming for you. And you will have a family of sorts. There will always be someone there for you, even in the darkest of times. Now fly away Little Bird, before it's too late."

The Duplicate hugged her briefly then pushed both Aderyn and the Doctor towards the open crack. They ran. As much as they both wanted to stay, they both knew that this is not where they belonged. Within a second of them getting back into Amy's bedroom the crack had closed. When Aderyn looked at the wall, the crack had completely vanished.