The following day Jack appeared on their door at precisely 8 in the morning. Sherlock opened the door watching as the Captain walked into the small flat.

"Thought it would be bigger" Said Jack his scanning the small living room.

Sherlock looked around "It's big enough for what we do, it's not like we spend a lot of time inside here anyway" Sherlock walked towards the chair he usually sat at and stared at Jack, who had not moved since entering the apartment.

Jack walked towards Sherlock, still unsure if agreeing to work with Sherlock and John had been a good idea. "Is that a skull? A real skull?" Sherlock smirked, the reaction to the skull not at all new to him. The two men stared at each other for a moment, not knowing how to start a conversation. John walked into the living room minutes later to find Sherlock and Jack sitting across each other doing nothing but staring at the other person.

"Are you two alright?" he asked, frowning when he was ignored by both men. "So Jack, where do you think we should start?"

"Start what?" Jack sounded like he wasn't paying attention to what was happening. Suddenly Jack's head shot up and he looked at John "Of course! We should start at… I guess we could go to the place of the crime and see if the alien left anything for us to follow" His voice was uncertain, not sure if it was really the place to start the investigation.

"Let's go then…" Sherlock said, startling the two other men. Sherlock got up and walked towards the coat rack, where he picked up both his long coat and his blue scarf. After putting both on he walked out of the door, going down the stairs and leaving the apartment building.

Jack looked at John and after sharing a look they both walked towards the door and after leaving the apartment and heading to the stairs John looked the door behind him. Jack looked at Sherlock, who was starting to walk to the other side of the street in the direction of the house where the private book collection used to be.

"Where did the man keep his books?" He asked Jack, who simply shrugged and continued walking "There isn't enough space in the room where we met for the first time to keep as many books as he had" John was still a few feet behind but he was able to hear the annoyance in Sherlock's voice. Sherlock Holmes didn't like to not know something, and right now he knew almost nothing of this case.

"It's a big house, there could be some… secret room or something" Jack said, not being able to giggle at the thought of a secret library. John and Sherlock shared a look, knowing that if was probably the only explanation to the fact that the house wasn't big enough to have 20 thousand books inside it.

"Well, there's only one way to find out: Let's explore it!" John said, his voice full of fake enthusiasm. The house was still filled with Lestrade's team, with made walking around the small corridors much more difficult.

After walking aimlessly around the house for over two hours John had enough of it. "We are never going to find anything here!" He yelled banging at the wall in frustration. After hitting the wall a couple more times he realized that the wall was in fact not a wall at all, it was door (a door that was very well hidden). "Sherlock! Jack!" He yelled calling the other two men "I found the door!"

Not a minute later both men appeared one from each side of the corridor, they were both covered in sweat. "Where?" Sherlock asked, not caring if he was polite or not. John simply pointed at the wall he had been hitting just a couple minutes earlier. "How do you know it's not just a wall?"

"It's not solid" The answer was followed by Sherlock hitting the wall/door and proving that it was, indeed, not solid. Sherlock started to run his hands up and down the wall/door, until he found what he was looking for: a part of the wall/door that was not leveled with the rest of it. After pushing it, the three men gave a step back and listened to the soft hum of a motor. The door opened to reveal a dark stairwell. A scream came from somewhere inside the house followed by an explosion.

Dun Dun Dun DUUUUUN!

A/N: I'm being really evil and leaving you guys with a sort-of cliffhanger, but I promise I'll try to update as soon as possible. Tell me what you think :)