It took two weeks. Two weeks of research and travelling to track down the last sliver left open between the universes.

"Could you write her a letter or something, Rose? I don't know how it could work exactly but maybe we could send her something small and it would survive." The breach they had found was nothing less than a black hole. The Doctor had wracked his brains for three days before remembering the tiny comment Rose had made ages ago.

On the planet Krop Tor, they had been stranded and discussing the very possibility of a planet orbiting a black hole when Rose had said something. "In films and things, they say black holes are like gateways to another universe…" The Doctor's response was negligible at this point, but the comment made by Rose was something incredibly important. If a black hole could be a gateway to another universe, all the Doctor had to do was find the right black hole. The rest of the time had been spent finding the correct portal. There was no guarantee when the package would go through but as long as it was addressed correctly, perhaps they could pull a 'Back-to-the-Future' stunt.

"A what?" Rose asked.

The Doctor paused in his work with TARDIS console. "Blimey, you've never seen 'Back to the Future'? Rose, sometimes I wonder why you came with me in the first place. It's an American film from the 1980s. They made two sequels, and in one of them Doc Brown gets accidently sent back to 1885. He writes a letter to Marty McFly, the main character, explaining what happened but writes that it not be delivered to a specific place until a specific day."

Rose nodded. "But Doctor are you sure you'll be able to calculate the right date and place?"

The thin man shrugged as he flitted about his beloved machine. "Pete said that universe was three years ahead of this one. We could address it to Torchwood three years after Canary Wharf."

Rose frowned. "Why Torchwood?"

"Because I can't think of anywhere else. You come up with the place and the letter, I'll give you the time, alright?" The Doctor was distracted. As easy as he made it seem on Krop Tor, resisting the pull of a black hole was a lot harder than it looked. He had found the correct location, now he had to get the timing of when they arrived at the black hole exactly right. If he over shot it by one day, even an hour, the force of the black hole's gravitational pull could be too strong to resist for the TARDIS, especially after just materializing.

Rose leaned up against a rail, watching him work. What could she possibly say to her mother? She had left her for a man. Would she be angry, afraid, maybe even spiteful? Rose had never done anything like this so she had no prior experience to compare her mother's reaction to. Rose had always picked her mother over anything else. For the first time, she hadn't…

The Doctor let out a short bark of laughter and Rose looked up. "I found it! The perfect spot. We'll go there tomorrow. I know for a fact that I am exhausted from my calculations and you, Rose Tyler, have a letter to write."

Rose looked into his face, giving him a small smile. "Aye, I do."

The Doctor could see the pain and sadness in her eyes. He never meant to separate the two of them. He took her in his arms, resting his chin on her head. "I'm sorry, Rose. I'm so sorry."

Rose pulled away. "Oh stop it, you." She smacked him lightly on the arm and smiled at him again, happier. "I told you forever." With that, she turned and head towards her room. Hopefully she could find some paper and a pencil in the desk the TARDIS put in her room.