The Doctor flew the TARDIS out of St. Bart's and back to 221c. Lestrade woke up during the journey, very confused, and tried to jump out of the doors.
"You really shouldn't do that!" shouted The Doctor over the roar of the flying TARDIS.
"Who are you?!"
"I'm The Doctor!"
"I thought he was the doctor!" Lestrade shouted, pointing at John.
"He's a doctor. I'm The Doctor!"
"Thanks, mate!" John shouted, clinging on to the TARDIS core. The Doctor laughed. Sherlock, meanwhile, had accidentally let go of the core and fell backwards, grabbing on to the end of The Doctor's coat, looking terrified.
"Sherlock, let go of my coat!"
"I can't, I'll fall over!"
"You've just survived the Gallifreyan equivalent of a cardiac arrest! You'll live!"
One painful and nauseating TARDIS journey later, the four men were lying exhausted on the floor of The Doctor's flat, John explaining the whole situation to Lestrade.
"So...Sherlock has two hearts?"
John nodded.
"And he got one from The Doctor?"
John nodded again.
"Right. Thanks for rescuing me and everything, but I think I need to get home..."
"Yeah, I think you should probably get some rest."
Lestrade nodded, and with his hand on his head, got up and wandered through the door of 221c.
"You do realize that if it was the other way around, and The Master induced a cardiac arrest that affected you rather than me, you'd be dead." Sherlock said to The Doctor a minute later.
"I know that."
"You're welcome."
"I have nothing to thank you for!"
"I saved your life."
"I saved your life!"
"Then we're even."
The Doctor sighed, and rolled over to face John. "I don't know ow you've managed to put up with him for so long and still be sane."
"Barely. Barely sane."
What does Moriarty want...? To destroy me? Merely play with me? I don't know. I don't know...
Sherlock's eyes snapped open when he heard someone walking through the doorway, but it was Mycroft, so he closed them again.
"What is going on?"
"Leave me alone, Mycroft, I'm sleeping. Can't you see I'm sleeping? I'm asleep. Of course I'm asleep. Let me sleep, you're always telling me to sleep so let me sleep!"
Mycroft looked at his little brother quizzically. Nicotene patches or caffine overdose? He didn't care, so long as it wasn't anything stronger.
"There has been a blue box...manifesting in 221c nearly every day for two months."
"You really are paranoid enough to put CCTV cameras in the basement under my flat. Should I be touched? I suppose you care, but it is rather...for want of a better word, creepy. It's bad enough having cameras in here. Although it was nice of you to keep them out of the bathroom- but then I would have disabled them anyway..."
"Don't avoid the question, please, Sherlock. It's probably some clever ICT trickery you've managed to enforce on my CCTV network, but it's my duty to find out the truth."
Sherlock half-laughed. "I'll tell you the truth but you won't believe a word of it; you might even assume I'm on drugs and send me back to rehab. I wouldn't be surprised."
That didn't sound good to the older Holmes. He sighed.
"I recently discovered that I have two hearts. I encountered an alien, who looks completely human, who is from Gallifrey, a dead planet. he is- was, if he never gets his heart back -the last of his kind. He only has one heart now. The 'blue box' is the TARDIS- time and relative dimensions in space. In simple terms, a time machine. Would you like some tea, brother dearest?"
"Milk, no sugar."