A/N: Just for any of you perhaps suffering from Sherlock/Doctor Who withdrawal symptoms. Hope you like it! Reviews are like hot chocolate with marshmallows to me! The next chapters won't be uploaded for a few days- so bear that in mind. Happy reading!

Disclaimer: I don't own Sherlock or Doctor Who or anything although I wish I did.

The Unsolvable Case.

Chapter One- In the beginning.

Sherlock's POV.

Sherlock sat down on the sofa and sighed. He could not believe this was happening, he had been at this case all night trying to figure it out clutching at straws but had got nowhere. He even had asked John earlier which he just did not do. The case was this, a sixteen year old boy dead on his way home from the cinema. Sounds simple enough until you look at the details. The boy had clearly collapsed for some reason but had no tell-tale signs of bruises or stabbing and was in a fixed position staring with his arms outstretched. The body had been sent off for a post-mortem and the results had been inconclusive, no cause of death could be found. Sherlock himself tried to come up with an answer, pacing back and forth in his flat feeling as frustrated as he'd swear he's ever been. No such luck.

Now having asked John in which he'd shrugged and pointed out "If you can't figure out a case then how am I, a man of lesser nature meant to?" Sherlock sat in his flat playing his violin tunelessly while time ticked slowly away.

The sun rose but Sherlock was still sat in the same room, playing his violin worry lines expressed on his face. Mrs Hudson burst in "SHERLOCK!" she cried, "You must be exhausted playing that violin all night! Not ignoring the fact that you kept me and I'm sure John up all night too." Sherlock merely looked over and then continued playing. Mrs Hudson stared at him as though she was deep in thought and shut the door quietly running down the stairs calling John's name.

Moments later a shout was heard from downstairs and Sherlock finally put down his violin to work out what was going on. John was stood at the bottom of the stairs looking concerned at Sherlock. He shook his head at Sherlock and mumbled "You finally put down that darned violin then" as Sherlock glared at him wordlessly. They both walked into the living room and sat down. Mrs Hudson peered at them from the kitchen while making tea and cleared her throat reminding John to speak. John patted the chair with his hand nervously "Sherlock.. there's been another one. Another case I mean.. another boy dead, with no cause." he finished staring at Sherlock expecting some kind of reaction but Sherlock simply frowned and clamped his fists together. This was going to be a long day.

St Bart's was deserted apart from Molly Hooper who was desperately trying to help Sherlock with his latest case. Of course they weren't getting anywhere. Molly was pointing out various hypotheses but at every one mentioned, Sherlock grunted and glared at her as if she had no idea what she was on about. Five hours later and no progress had been made apart from Sherlock starting to show his frustration by every now and then punching the wall.

Suddenly a loud whirring noise was heard and a shadow of a blue police box appeared in the corner of the room. Molly and Sherlock looked at each other perplexed, waiting hesitantly for those blue doors to open..

The Doctor's POV.

The Doctor sighed to himself as Rory and Amy were arguing yet again. The shouting was louder this time and about some silly topic, he hadn't bothered with the details. He lent on the Tardis's controls and began to fall asleep...

He was having a nice dream one about the prospect of fish fingers and custard for tea when he was awoken by a loud beep coming from a screen nearby. He squinted at the brightly lit blue screen which had the words "WARNING: EARTH AT RISK" running across the middle. At this he flipped out and started to panic flipping random switches on the controls trying to land as soon as possible, preferably on earth.

Although, Amy and Rory were still arguing they had noticed a sudden urgency from the other room and quietened listening to The Doctor switching on and off controls. They looked at each other confused, sighed and walked into the control room not knowing what to expect. Whatever they were prepared for wasn't this, The Doctor looking red and panicky flicking random controls now and again grumbling to himself about earthlings and such.

Rory cleared his throat "Urm.. Doctor.." he said pointing to his apparent madness. Amy looked at The Doctor and nodded slowly, before turning to Rory and simply stating "Looks like we're going back home".