The girls stood in silence with their mouths wide open for a moment longer. They had thought it a strange occurrence that two people from different countries could look so freakishly similar, but neither had put 1+1 together and got "sisters"; not until they began to talk about parents and peculiar items of clothing.

"This is so incredible!" Charlie spoke through the tears that were threatening to fall, as they both lowered their sides of the photo.

"I know!" Annie replied, pulling her sister into a tight hug.

The rest of the evening was spent in a similar manner of shock, awe, and sheer joy at the almost unbelievable discovery, and the incredible circumstances that had brought them together after almost twelve years of separation. At dinner observers would have been able to see the two inmates of the isolation cabin not eating their meal in silence, chancing deadly glares at each other (as per usual), but in heated discussion, and with huge smiles painted across their faces. They both had had little (if any) time to interact with their friends from their previous huts, but that didn't seem to matter now. They had a sister; someone to share all the ups and downs of their family life with. Someone who could become closer than any friend made over the summer break, thousands of miles away from home.

"What's mom like?" Charlie spoke in a hushed voice that night. There was no need for the two girls to talk quietly; they were the only two people in the hut, and the nearest hut was a couple hundred yards away down the hill. However, the girls had pushed their beds together, and so the closer proximity made their normal talking volume seem slightly excessive.

"Well, she's very pretty, as you could see, and very funny. Aunt Lydia says that her ability to entertain was always one of her strongest points."

"Is aunt Lydia older or younger?"

"She's younger. Aunt Jane is the oldest, then mum, then aunt Lydia. I think aunt Lydia came over the England with mum, but aunt Jane stayed in New York with her husband Bing, and their children of course." Annie paused as she shifted her mind back onto the original question. "She's also really kind. Whenever I'm home from school ill, she always lets me on the internet or television, she gives me a hot water bottle, and all the chocolate stored in the house."

"That sounds great!"

"It is! But after a day or two it gets kinda boring, so I end up wanting to go back to school, and that's how she stops me from skiving!"

"Skiving?" Charlie inquired.

"It's slang. It means 'to deliberately miss' something."

"So like 'shirking'?"

"Yeah, I think so!" Annie smiled.

"Right. That makes sense. In that case she's also very clever!"

"She also has her own company. It's called Longbourn Media, and it specialises in what she calls 'fostering online talent'. I think that means she just finds good people online, and helps their career along somehow."

"That's pretty cool. Like, she helps vloggers and stuff?"

"Yeah, in fact I think she used to vlog, but I have no idea whether you can still watch it." Annie sighed. She knew it would mean more than anything to Charlie if they could just find something as personal as their mum's vlog and watch it.

"Well, dad's company Pemberley Digital specialises in app development."

"Hence, Illuminate Me!" Annie giggled.

"Yep! And he's just the best dad ever. He often takes me out on trips – just the two of us. All we do is chat and chat and laugh until it's late. Aunt Gigi is awesome as well. Nothing's too weird or embarrassing to talk about with her, and if dad gets a bit quiet and difficult to read, she's always there to talk to."

"He gets difficult to talk to?" Annie worried that she might not find him quite as friendly as she hoped.

"Well, not really. He's a bit socially awkward sometimes, and him being my dad it does mean that he does put his foot down occasionally. But he's still great to talk to – when you know him like family and friends know him."

"Ah! Ok. I wish I could know him like you know him."

"I wish I knew mom like you know her."

At this, Annie closed her eyes to try and imagine how her father walked, talked, sat, stood; everything that she couldn't already tell from the photo. However, instead of her father's face entering her mind, something else entirely came to her.

Annie sat up suddenly. "I have a brilliant beyond brilliant idea!"

"What's that?" Charlie responded and sat up as well.

"Well, you've always wanted to know what mum's like, and I want to know what dad's like…"

"Yes?"

"And we're completely identical to one another…"

"And?"

"So why don't we switch places?" Annie's face lit up as she got to the point of her magnificent plan.

"Switch places?"

"It would be perfect! I could go back to San Francisco as you, and you could go back to London as me. We get to know the other parent, and then eventually, we tell them the truth. When we do, they'll have to unswitch us!"

The sheer genius of the plan began to dawn on Charlie's face. "And when they do, they'll meet face to face, after all these years!"

"Exactly!" Both the girls' faces were light up at the idea.

"But how can we do this? I mean, we both look the same, but we have different accents!"

"You heard how well I copied aunt Gigi from your voicemail, didn't you? The thing that gave it away in the end was me mentioning mum, and don't worry about my accent. I'll teach you."

"But we have to know everything about each other's cities, homes, rooms, family and friends, pets, whatever."

"We've got six weeks left. That's loads of time to learn that, especially if we're going to spend most of it in here."

"Do you really think this could bring them back together?" Charlie's questions and doubts were clearly lessening now.

"Well, I don't know about dad, but mum hasn't shown any sign of getting married again any time soon."

"Neither has dad."

"And they clearly still think about each other."

"How do you know that?"

"Ladies and gentlemen, I present to you exhibits A, B, and C." Annie spoke with all the snobbery she could muster as she lifted the newsie cap, bowtie, and plaid shirt off the chair next to her bed.

Three weeks into the girls' intensive "Be Like Your Sister" course, and things were advancing at a great pace. They had learnt the faces of their family, the faces of their school friends and teachers, the layout of their houses, and they were now beginning to learn more about each other's interests.

"So…he's an alien, and he travels in time and space in this blue phone box with pretty people?" Charlie's eyebrows knitted together.

"Well, they're not always that pretty, but yeah."

"Why?"

"Why? Because he chose to leave his home planet and fight evil and save the universe. Perhaps also a strong desire to be heroic, I guess." Annie's arms were flying all over the place, expressing her passion for the show.

"And he always travels with someone?"

"Yeah, because otherwise he'll get lonely. They're his companions."

"Do you have a favorite companion then?" Charlie enquired.

Annie pondered the question before replying with a short, "Marian".

Later that week, they made yet another startling discovery.

"Holy moley." Charlie muttered to herself whilst watching her phone over breakfast outside Saturday morning.

"What is it?"

"Well, you know how you mentioned that mom used to vlog?"

"Yeah?"

"Well, I think I've found them."

"How? Where?"

"On this site – Youtube, it's called."

"Hey, I've heard of that!" Annie kicked herself in frustration. "Our parents' generation loves that site! I don't know why I didn't think of it before."

"Well, they're called 'The Lizzie Bennet Diaries', and they were uploaded between April 2012 and March 2013." At this, Annie shifted round the picnic table to sit next to her sister, instead of opposite.

"Well, play them then!"

About this time, Annie was perfecting her Californian accent, and Charlie was making good progress on her RP English accent. Charlie had bemoaned as to why it seemed much harder for her to grasp her sister's accent, than it seemed to be for Annie to grasp Charlie's. Annie needed only to reply about how much more American media was available in the UK, as opposed to British media in America, and Charlie took that as a decent explanation. The very little time the two girls could interact with the rest of the camp (and their previous hut-friends) was nearly always spent imitating their sister, and by the end of the final week, their friends could hardly tell the two girls apart, until they noticed the hair length.

"You've gotta cut your hair, it's the only way it's gonna work." Charlie insisted whilst they regrouped after another switch which had very nearly failed.

"But I like my long hair! No. No no no, no. I won't do it. I just won't!"

"Oh c'mon!" Charlie practically threw some stale-looking mash potato on her tray for her dinner. "Dad and aunt Gigi are so not going to believe that I managed to grow my hair six inches over the course of eight weeks."

To this, Annie gave her sister a long side-glare, as much of her focus was on avoiding putting any food that was past its edible phase on her tray.

"Alright, alright." Annie began to tear up as she looked down at her tips brushing the top of her small pile of peas. "But please, please, "she emphasised, "be careful with the cut. Especially round the sides!"

Three hours and many long held breaths later, and the two sisters stood side by side at the mirror in the isolation hut. If it hadn't have been for the accents, no one would have been able to tell the difference.

"I think," Annie began in her best Californian accent, "we're ready."

Charlie replied in her RP voice. "Indeed we are."

Just to clarify, Marian is one of my own headcanon Doctor Who creations. I'm sorry I couldn't resist mentioning her.