They arrived at the crime scene at around 11pm, but it did not seem less busy than normal because of the late hour. Lestrade was there to greet them when they arrived, but unfortunately, so was Anderson.

"Donovan been scrubbing floors again, Anderson?" Sherlock said snidely, quickly passing him before he could reply.

DI Lestrade explained the case;

"A by-passer called it in. He saw a black figure fall off the top of a building, and called police, and when they investigated, they found the figure was actually a burnt person covered in a thick black blanket. The marks are extremely severe, victim's been burning for around a day. The fire was only put out in the last two hours or so, the victim is still wet from the killer extinguishing the flames. It would have been hard to see in the dark, so no-one knew anything until the victim had hit the pavement."
"How come the door of the business complex is open?" John asked

"If we knew, you wouldn't be here. Someone should have locked it before they left, but the person responsible for locking up has dropped the key down a drain in his house, and the owner has had to lock up and open the complex for the last few days until a spare key can be made. But the business was closed today, as it is Sunday, and the owner was away in another part of London, visiting relatives. His alibi is confirmed, and we're checking the drain alibi as we speak. No ID on the victim as of yet, but we're working on it."

"Hmm" Sherlock said, deep in thought. "So no idea on how the victim got in?"
"None. We know he left via the doors, we found some male footprints that were left in the last 24 hours, only one pair, and they were exiting footprints, not entering. They were slightly damp from extinguishing the flames, so we know it was the murderer"

"So the first question is how he got in" Sherlock surmised, looking around the entrance, looking for details. He couldn't climb and carry a person, especially not without being seen. All the windows were closed, and according to Lestrade, locked. The only markings on them were from weeks ago, as it was cold and the heater had been on. Sherlock looked around for a hidden entrance, a fake wall, but he found nothing. The police squad were slowly leaving, figuring they would work better after some sleep. Eventually, even Anderson and Lestrade had had enough. John managed to take Sherlock away, too, telling him he would be able to come back tomorrow when there was a better light.

Obviously Sherlock couldn't sleep, instead paced around his apartment until he felt the need to pull out his violin. John was dozing on the couch, but was woken by the sounds of the violin. The look on Sherlock's face was a concentrated frustration, and it was clear he couldn't figure out how the killer got inside. He was convinced there must be a secret door, another entry, and was anxious to continue searching for it. Almost two hours later, Sherlock lay down his violin and began pacing again; trying to picture the building and an area he had not searched.

By morning, he had figured a few spots that he wasn't sure he'd checked well in the dark, but was still pretty certain he had. It wasn't very much to go on, but he was desperate for evidence. With serial killers, you had to wait for them to slip up, and it seemed that this one hadn't yet- assuming he was, in fact, a serial killer.

"It's so hard, I feel like there's something right there and I can't see it, I can't focus on it properly!" Sherlock complained, to no one in particular. Sherlock had just woken John up so he could get ready to go to the crime scene faster.

"I can't figure it out! How did he get in?" Sherlock continued to yell, as if telling the world his problem would fix it, but he knew too well that John was the only person that could hear him, and he was more puzzled than Sherlock. As was everyone else, Anderson, Lestrade, they all knew Sherlock could get the answer, would get the answer, and so did Sherlock. He just didn't quite know how yet.

"What you need is to forget about it, and come back to it" John said wearily.

"And what could possibly distract my mind from the case?" Sherlock asked, knowing that nothing would come between him and a case.

"Well, normal men would meet up with a date to distract themselves from something"

"But normal men would not become addicted to a crime in the first place" Sherlock rebutted. John sighed, and dragged himself off the couch.

"No, normal men would not. You want something to eat?"

"No. Thinking" Was all Sherlock said, as he descended into silence one again.

After John had gotten ready, and Sherlock had thought in silence some more, the two headed off for the crime scene once more. Sherlock was still convinced in a secret panel of some type. The owner had arrived back in the local part of London very early that morning, but after a few coffees was readily dealing with the press and the police's question. Having been a part of designing the building, he was quite against Sherlock searching it for a secret panel, energetically denying any such panel. After almost of an hour of Sherlock searching in vain, Anderson came over to him.

"Face it, you've got no clue. Now get off the scene so we can do the serious investigating" He commanded, and although Sherlock felt himself his superior, he was right about having no clue, and accepted the fact that he would be more successful figuring out this crime with his violin at home. Slightly depressed, Sherlock and John headed to 221B Baker Street.

In the cab, John asked him about his suspicions, and he sadly confessed he was coming up blank. After a long silence, Sherlock sighed.

"John, do you remember which pocket I put Claire's number in?"

"Bottom left... you're going to call her?"

"I can't think of any better ideas, even though this is quite a pathetic one" Sherlock said. John decided to take it as a compliment instead of an insult. He had, after all, come up with the idea.

He watched as Sherlock called Claire, and considered how normal he was at that very moment.

A/N: Please tell me your opinions by leaving a comment, good or bad. It will greatly help me to improve the stories. Thanks.