Hia, this is my first attempt at a crossover, but this idea really began to form after I finished reading The Infernal Devices for the second time so I thought I'd give it a shot. Hope you enjoy, please review 3

Jace was still smiling when he walked down the familiar corridor to his room in the New York Institute. Seeing Clary always put him in a good mood, even the sound of her name gave him butterflies. He pushed open his door and looked into the room, it was as it always was, too clean and yet not ever clean enough. There was just one change, one big change.

There was a girl standing in his room.

Not any ordinary girl ever. This girl was about ten years old, with long wavy black hair and bright clear blue eyes. She was wearing a long black dress, that reminded Jace of something he had seen in a history book to do with Victorian England.

After he realised he had been standing staring at her for a couple of minutes he abruptly cleared his throat and questioned "What are you doing here?" adding as an afterthought "Who are you?"

She did not answer his question, in fact the only thing she done to indicate she had heard him at all was to raise an eyebrow.

Perplexed he tried again "Are you a shadowhunter?"

She continued to stare.

Getting slightly annoyed now he said "You're not meant to be up here if you want to talk to somebody you need to go down stairs."

This time she moved and walked past him out the door. Following her he realise she must have been in an Institute before because she moved with nothing but certainty, which was almost impossible for someone with no experience because Institutes were built purposely like labyrinths.

Eventually they made it to the bottom floor just in time for the front door to open. Clary walked in first, Simon following, both were laughing. The girl stopped in her tracks and froze. Both Clary and Simon stared at the girl, Simon's mouth dropping open.

Clary caught sight of Jace and asked in a slightly higher pitch than normal "Who's this?"

"I have no idea, she doesn't really talk."

"Maybe she doesn't like you" Simon noted unhelpfully.

"Maybe" he said "But that is highly unlikely everyone likes me"

Clary rolled her eyes and addressed the girl "Are lost?"

The girl stayed silent. More amounts of people seemed to be agitating her rather than scaring her, which would have been a normal reaction for a young girl surrounded by strangers.

Clary looked at him for help but he just shrugged as confused as her. Simon was just staring trying to figure out whether she was a shadowhunter probably.

The door opened again but this time Alec walked in, it had clearly began to snow outside as his hair was covered in white flakes. He looked up to see why they were all standing in the entrance hall. For the first time to girl reacted, a very small gasp almost inaudible in fact, but because everyone had been watching her so intently the noise might have been a shout.

Alec's eyebrows drew together in confusion, as the Institute door opened one last time to admit Magnus, who was covered in a thick layer of snow.

"Magnus!" at last the girl had broken her silence saying the warlocks name like a prayer.

Magnus looked up and sighed "Well that's not good."