The light in the darkness

[Fanfiction Cancelled]
Tessa Gray, the girl that has the power to transform.
Jem Carstairs, the boy that plays the violin, William Herondale's parabatai.
This story is happening after Clockwork Angel. After Tessa is invited to stay in the Institute as long as she wants. After Will pushes Tessa away, she falls in love with Jem.