Finding Clarity

In Victorian times, a young girl born into the Carstairs family is cursed. The daughter of Colette Verlac and Elias Carstairs is born with many blessings, but one blessing would become a curse. To live a long life.
Clarity Carstairs has lived the long life she was graced with, but she doesn't look a day over nineteen. She has seen her loved ones come and go, and watched battles be won and lost.

Clarity finds herself in modern day New York, visiting her oldest friend, Magnus Bane, and encounters a descendant of her dearly departed friend Will Herondale.
Her past starts to haunt her as she comes to care for the Shadowhunters in the New York Institute, and when her long lost cousin, Jem Carstairs, appears, she may just find out that it's impossible to stop caring to save herself the pain.

I do not own any Shadowhunters that you recognize, I don't own the institutes, nor any of the Downworlders that are mentioned in the Mortal Instruments and Infernal Devices books. You'll see Magnus, the Lightwoods, Clary, Will, Jem, and many others from both series.