A/N: First, I would like to say thanks to everyone who put this on their story alert and put this on their favorites. So, anyway, how this is working is most of the time I will write a chapter and my sister would do the corrections and other things, sometimes it'll be the other way around. Thanks.

Darcy didn't think the crime scene was very brutal. She's seen worse. She was happy as she walked under the yellow police line. She could continue to avoid her Uncle Mycroft while being out of the house.

"Who's that?" a man asked.

Darcy looked at him, he obviously didn't have much intelligent but she was going to pretend that she didn't notice. Unlike her favorite uncle, she had no desire to make enemies.

"Sherlock's…I'm sorry I don't really know who you are," Lestrade said looking at her.

"Niece," Darcy explained, "I'm his niece."

"Of course."

Darcy walked over to where the body was and smiled. She loved the thrill of the murder just like her mother does. She looked up to John staring strangely at her. She stopped smiling.

"Murderer has had experience-" Darcy started.

Lestrade interrupted, "Military?"

Darcy sighed, determined not to get annoyed like Sherlock would. "No, you need to find all murders recently and within the last year that's similar to this one. And when I say similar I mean knife wound in the stomach, not sign of struggle, but not necessarily in alleys."

Lestrade nodded in shock at how alike Darcy was to Sherlock. He soon recovered and turned around and engaged in conversation with an officer next to him.

When Darcy stood she saw the man had a strange bracelet on his wrist. She knelt down and took it off carefully and underneath it she saw two small puncture wounds.

"John!" She called.

John came and knelt next to her and saw the puncture wounds, "What's that?"

"Puncture wounds, can you tell me what the cause of death was?"

John looked at the body again, "Stabbed through the stomach."

Darcy smiled, "Exactly, because the 'fang' marks were made after death."

"Let's tell Lestrade…" John started to stand up but Darcy pulled him back down.

"No." Darcy could hear the coldness in her own voice, "He'll automatically think something preposterous and it'll cloud his judgment."

John was confused, "Then what do we do?"

"Keep it a secret." Darcy stood and look left the crime scene. "Lets go shall we? I'm quite tired."

As soon as Darcy got back to Baker Street she barely noticed that Sherlock hadn't moved since John and her had left. She collapsed on the couch.

"Boring wasn't it," stated Sherlock, ignoring Darcy's tiredness.

"Actually it wasn't that bad. I'm pretty sure it's a serial killer. Left some puncture wounds on the victim's wrist, covered by a bracelet. I told Lestrade to hand the case over to you. It's a bit much for my first murder case."

Sherlock and Darcy stared each other down while Darcy explained the case to her now legal guardian. When John walked in neither of them looked up, though they were aware he was there.

"Darcy, are you going to stay with us?" John asked

Darcy finally looked up as she spoke, "Just until I turn 18 or when I my...never mind."

The end if her sentence faltered when she realized she didn't feel like talking to John about her situation.

John however wasn't quite ready to let the conversation go, "Who's your father?"

"Why are you so interested?" Darcy's words came out harsher then she meant them to be and she flinched internally, "Sorry." She muttered.

"It's fine."

Sherlock, who had been dead to the conversation until then looked at Darcy, "Why are you still here, didn't Avalon ever teach you to get some sleep?"

Darcy's smile was smug but she got up and walked to the guest room, but before she left she turned around, "In case you forgot Sherlock, children learn from example."