A/N: this is my first fanfiction so please be nice. Flames are welcome but be nice about them. I'm open to any ideas you have.

Basically this happens during City of Glass right after Jace gets done yelling at Clary. Something goes terribly wrong leaving Jace guilty as ever but maybe something good will come out of all this badness.

Disclaimer: I do not own the mortal Instruments. Cassandra Clare does

Clary's POV:

Clary stormed out of the house her previously unshed tears spilling over and running down her face. She fought to contain her sobs as she tried desperately to find her way back to Amatis' house. She soon found an old stone bench and sat down sobs wrenching her whole body. Jace hated her. It's your entire fault Clary she reprimanded herself. You're just a stupid, weak, reckless, mundane. You're just the stupid sister that he doesn't want, a screw-up. Clary couldn't help as the tears came faster. She wanted to hate Jace, she did but that was impossible. It was like willing the sun to not come up in the morning. She loved Jace with all her heart even if it was wrong. No Clary thought to herself don't think about that it'll just get you more upset. She was so absorbed in her thoughts that he didn't notice as Sebastian walked up and took a seat next to her. She only noticed when she felt strong arms wrap around her.

"Hey clary I heard what happened do you want to talk about it"he whispered calmly to her.

"No, not right now but why are you talking to me anyway, im just a stupid reckless mundie" clary replied with disgust creeping into her tone at the end.

"You're not a stupid mundane Clary,. Jace was wrong, he's the stupid one not you."

"No, he's not stupid" Clary didn't know why she was defending Jace, she might not hate him but she was defiantly angry even if what he said was true.

Sebastian pulled Clary in closer to him hugging her. It felt wrong somehow but right now she needed someone to be there. She let the tears fall staining Sebastian's shirt. Clary didn't notice Sebastian taking one hand away. Nor did she notice him pull out a needle and move his hand towards her. Suddenly Clary felt a sudden stab of pain in her side and the grogginess. Darkness started to take over and Clary looked up. The last thing Clary saw before the darkness took over was Sebastian with a wicked grin on his face.

Jace's POV

Jace paced his room guilt eating at his insides. He was too harsh on Clary. Isabelle had been right he had destroyed her; he had seen it in her eyes as she left. But Clary was at least safe now. Jace tried to push all thoughts on clary to the back of his mind and compose himself. After he thought he was suitable he went back down stairs.

A few hours had passes but Jace couldn't stop thinking about Clary. Jace couldn't help but think that something was wrong, very wrong. A sudden frantic knocking on the door jolted Jace out of his revere. Isabelle ran to the door and gracefully threw it open. A woman was at the door looking panicked and worried.

"I'm Amatis, is Clary here? I assumed she came over here to talk to you but that was hours ago and she never came back."

Jace's stomach clenched and he felt as if he couldn't breathe.

"N-No C-Clary left a few hours ago" Isabelle stuttered. Sebastian came down the stairs holding something.

"Jace this is addressed to you" he said handing him an envelope. Jae carefully opened the envelope and pulled out a letter. Fancy scrawl covered the page and he started to read.

Jace,

You stupid little angel boy, you really messed things up this time. All you little shadowhunters think you know it all but you are all wrong. You think that you are the son of Valentine that you have any right to the Morgenstern name. No you are just a ghost baby. The result of a baby saved from a dying body. And you also thought that you had any right to say that you have greater demon blood running through your veins. Ha no that is me. I am Clary's real brother, son of Valentine with Greater Demon blood proudly running through my veins. You are the soft "son" the one with precious angel blood in you. So no Jace you are not Clary's brother you two could have loved each other and lived happily ever after but you screwed up. I found poor Clary sobbing all by herseld on a bench. She didn't even notice as I easily overpowered her. She was too upset thinking how she was a 'stupid, weak, reckless, mundane." Well she is stupid and weak but she could be powerful and now she must be eliminated. Valentine gave me the gracious gift of being the one to carry that out. The only regret I have is that you won't be there to her agonizing screams and pleas for death. Just know that she will be in agony as I slowly kill her and that it is all your fault. She will be begging for death before I'm done and it's all thanks to you. You left her alone and defenseless. I hope you live with that guilt for the rest of your life.

Jonathan Christopher Morgenstern

Jace thought he was gong to be sick. His hand trembled and the letter fluttered to the ground. Isabelle picked it up and read it aloud but Jace couldn't hear over the ringing in his ears. Clary was in pain or about to be, she could be dead. One thought was able to reach him through all this; Clary isn't your sister. His heart swelled at the thought and a new determination filled him. He would get her back and the they would spend the rest of their lives together.

I love you Clary, Jace thought, I'm coming for you. Just hold on I'll save you and then we have forever.