Clary's Little Secret

Clary is Jace's girlfriend and they train together. But what Jace doesn't know someone returns and won't leave Clary alone. But what will Jace do when he finds out and also finds that she did not tell him. Will he protect her or will it end their relationship. Simon and Izzy are dating and everything is ok but will happen if Simon doesn't try to make any moves on Isabelle. Isabelle might have to take matters into her own hands.