17 years earlier
Valentine had just taken the son that Celine Herondale had been pregnant with when he heard another cry coming from her womb.
"Another child?! Impossible!"
"It seems that Miss Celine here was having twins."
"I noticed that but we only need the boy."
"Yes but the other child, a girl it seems, also has extra angel blood in her body."
"Hmm. You take them both. I will come for the boy in a few days but give the girl to Charles Freeman. Tell him to raise the child in a valley near lake Llyn."
"Anything else?"
"Yes I will be calling on him and the girl in the future so they can be trained together."
"Fine. I must leave now though."
"Go and take care of the boy."
"Not the girl?"
"No I wanted a son that would not disappoint but I now have a boy and girl that will have to much love for each other."
With that Valentine walked casually out of the room that held the corpse of Celine Herondale and Hodge holding a baby boy, and girl.
Modern day
Jace P.O.V.
I was having a perfectly normal night; luring demons into closets and proceeding to kill thats not true he just kills them, Clary and Isabelle lure them. All was going fine till I saw the mundane girl dancing while seducing a demon that had taken the appearance of a tall broad shouldered blonde boy only thing was he had a "fake" devil tail that was black.
"Guys there is an idiot mundane girl over there seducing a eidolon demon." I said craning my next to see the others.
"Ugh stupid mundanes." Isabelle muttered under her breath.
"Hey!" Clary protested next her.
I turned to look back at the girl and saw that the boy was leading her down a hallway.
"Alec if you're done with that one we got another one and this one has a victim."
"I'm done lets go save this mundane."
When we got to the hallway we saw one of the doors at the end of the hallway swing closed.
I opened the door slowly and snuck in. Clary used her steele to cut her long ruby dress so it ended in the middle of her thigh. "God she looks beautiful." I thought.
We snuck past a few piles of boxes and saw the girl holding a seraph blade to the eidolon's neck.
"Where is Camille Belcourt?" the girl demanded.
"I do not know a Camille Belcourt." It hissed. It raised its tail behind the girl's back and was about to stab her in the back but luckily Alec shot an arrow through the tail immobilizing it.
"ARGH!" The demon screamed pushing the girl against the wall.
"Oph." "Isabelle, Alec take care of the demon."
"Clary, you and me will help the mundane."
"I am not a bloody mundane." the girl screamed charging the demon.
She grabbed another seraph blade that was in her back pocket. She jumped into the air over Alec and Isabelle. She plunged the blade into the demon's neck and slide down it's back dragging the blade through it at the same time. She hopped off and spinning both of the seraph blades, one in each hand. "Who are you bloody shadowhunters?" She asked in a thick english accent.
"We could ask you the same but it seems that is everyones reply so I will just cut to it. My name is Jace, the little redhead is Clary, and the other two are siblings, Alec and Isabelle. So now who are you?" I asked pointing to each person in turn.
"I am Cresselle, daughter of Stephen and Celine Herondale. But please call me Cress." She replied nonchalantly.
Flashback-12 years before
"Cressie come back!" A little Jace yells after a little girl.
"Come on Jacie! Its fun. We can play in the river!" the little girl calls back over her shoulder.
Little Jace and Little Cress reach the river and jump in. They play in the water before getting called back to the house. Cress runs ahead. She takes the turn around a bend and almost immediately screams.
"Cressie! I'm coming!" Jace screams running around the bend. He finds Cressie with her blond hair fanned out around her head on the ground and a demon standing above her with one set of his claws dripping blood.
"Get away from her!" He screams as he charges the demon.
They fight for a minute before the demon suddenly disappears in a blue puff of smoke.
Jace runs to the girl, he picks her up and starts running back to the house. When they reach the house Jace's and Cressie's fathers wait for them before rushing them both inside.
10 minutes a crestfallen Mr Wayland comes and tells Jace that Cress is dead and that there was nothing they could do.
End of Flashback
"Impossible." I whispered.
"How is my identity impossible, may I ask?"
"Because I am the last Herondale. Jace Herondale, son of Stephen and Celine Herondale. Also I thought you were dead."
"Well you obviously aren't and why in the world would you think I were dead?"
"Because I saw you die and I went to your funeral."
Well that is interesting. Now, could someone tell me where to find Camille Belcourt?" Cresselle, I mean Cress, retorted.
"You want to find Camile? Why?" Alec whispered to Cress.
"Because she killed my father." Cress responded in her annoyingly nonchalant way.
"Camille killed Stephen?" I asked Cress angrily.
"No she killed the man who raised me Charles Freeman. He used to be a member of the Circle."
"So the man that raised you was a friend of my…...dad?" Clary spoke for the first time.
"Yeah. He raised me at the old Herondale Manor in Idris."
"Lucky Herondale, don't you think Jace" Isabelle whispered teased me.
"Shut up, Iz."
"Well if you don't mind I have to go find Camille." Cress said walking over to the door.
"Hey wait Cress come back with us to the New York Institute." Clary called after her.
Cress just ignored us and ran out of the room.
"Shiz." I grumbled. We ran after her but we didn't see her in the crowd. We all ran outside and saw long blonde hair running up the street. Followed by a scream.