John glanced at his watch. They needed to leave soon if they were going to be on time.

"Sherlock, you ready?"

"Hmm... Yes." Sherlock languidly glanced up, then immediately returned to his experiment.

"That's a hint, Sherlock." John sighed.

"Is it?" Sherlock said, his mind elsewhere.

"It means we're leaving." John said. "Now."

"Just a moment."

"You've been saying that all morning."

"This is the last time, I promise." Sherlock held up a test tube towards the light, squinting at it.

"Why should I believe you?"

At these words, Sherlock's attention was immediately turned to John.

"I don't often promise, John. There is little of life that is predictable, including my own behavior. However when I do promise, I will do anything in my power to keep it. There is no situation in which I would willingly break a promise. Ever."

"Okay then." John nodded, slightly confused by the lengthy, seemingly overly so, explanation.

A story behind that, I'll bet. John thought.


"Nice to see you again." Dr. Trey greeted.

"And the same to you." John nodded. Trey turned to greet Sherlock.

"Ready for the first round of tests?" He asked.

"Of course." Sherlock lowered his head, bringing it back up only a moment later.

"Alright then. Come this way." Trey led them into an office and had both Sherlock and John sit down in chairs.

"First thing I would like to do is get the basics out of the way, just a few tests I have to do for comparison reasons. So, first up, IQ." Trey said. "I know it's not accurate, you could probably find more problems with it than I can, but we do it for paper work reasons. If you don't mind, I'd like to observe you while you take the test so I can take notes on how you figure out the answers."

"You'll be behind there." Sherlock pointed to a mirror hanging on the wall of the office.

Trey glanced over to the mirror then back to Sherlock.

"How could you tell it was two way?" He asked.

"It's not the first time I've been observed."

Trey noticed a minute movement on Sherlock's face, nothing more than a twitch of the lip, but it was the first sign of discomfort he had shown since arriving.

On the report it goes. Trey thought.

"Okay..." Trey took a second to refocus himself. "The test is sitting on the desk, just get started when ever you're ready. If you'll accompany me, John?"

"'Course" John nodded.

John and Trey exited the room, turned down the hallway, then walked into a small room with a large window viewing into Trey's office/examination room.

Trey gestured for John to have a seat, then did so himself, taking out a notebook in the process.

They watched as Sherlock began the test obviously quite concentrated on the, but as time went on it seemed Sherlock had a bit of difficulty keeping focus. He adjusted the position of his head repeatedly, looking at the paper with only his right eye, then only his left, with both, and various ways thereof.

"He's on the fourth page now." Trey said. "Does he have any vision problems? Does he wear glasses, contacts, anything like that?"

John shook his head.

"I forced him to go to the optometrist once," John said, "He has perfect vision. A tad sharper than most actually."

"Interesting." Trey watched closely as Sherlock continued to adjust the angle of his view. "On page four, he's supposed to count the number of rectangles in a particular shape. Lots of people have difficulty with the problem, but I've never seen anyone do this."

After a few minutes, Sherlock had apparently decided the answer to the problem, and then moved to the next.

Trey observed awhile longer before noticing the erratic movement of Sherlock's eyes as he solved the problems.

"The way he's moving his eyes." Trey said. "Is that normal?"

John looked to Sherlock then back at Trey, "Yeah, pretty normal. I mean, he doesn't do it constantly, but it's not rare."

"Any specific times when he does it more than most?" Trey asked.

"Uh..." John shook his head, looking up and to the left slightly as he thought. "When he's under pressure, when he's..." John paused, his head leveling. "When he's having trouble staying focused. I never thought about it that way before."

Trey nodded. "Thought so." he said. "The frantic movements of his eyes, it's a stress response."

"He does it when he's thinking sometimes too though." John added.

"That's one more thing to test." Trey said.

It was silent for a few minutes as they continued to observe Sherlock.

"Does he get overstimulated easily?" Trey asked, breaking the silence.

"I don't know, maybe." John said. "He wouldn't tell me if he did."

"Why?" Trey asked.

"I don't know, he's Sherlock." John answered. "Isn't that answer enough?"

"Not for me." Trey said. Trey took a step toward the mirror, closely scrutinizing every move Sherlock made. "I think there's something behind all this. I think there's at least one, maybe more, factors that we're not aware of. Something that has pushed him to become what he has. You've been missing a piece of the puzzle, plenty of pieces actually, and I'm going to find them for you."

"Like what?" John asked, taking a step closer himself.

"Promise me not to breath a word of this outside of this room."

John's eyebrow rose. "I promise..."

"There's this drug. It's called NZT. I heard about it while I was still living in America." Trey said, glancing momentarily at Sherlock before looking back to John. "Top secret sort of thing, even I wasn't to know about it if it were for a conversation I over heard."

"There's no way he's been-" John began, but Trey held up a hand to silence him.

"Hear me out." Trey said. "You know the average human uses only a small portion of their potential brain capacity?"

"Of course," John nodded.

"NZT unlocks the rest of it. It makes a person able to have complete and total control over their brain." Trey elaborated. "Users think faster, more efficiently, and have perfect recall. They make connections no one else could."

"I get what you're saying, and yeah, the results do seem to match up." John said. "But I can account for almost every single second of his day. There's no way he's taking anything. I would know if he was."

"Exactly." Trey said. "What ever makes his brain work like this, it's not synthetic, it's natural. It's either in his genetics or in his upbringing, in his nurture or nature. Maybe a mixture of both." Trey paused to take a breath, a slight smile on his face. "I've never seen anything like this before. It's... remarkable."


A/N: Sorry I haven't updated this for awhile, I've been busy. Anyway, kudos to anyone who caught my 'Limitless' reference.

Reviews please!