Simon's adopted sister, Julianne, aka Julie or Jules, was actually born a Shadowhunter, though nobody ever knew it. Suddenly, she gets taken from her bed by vampires not to be seen again for years. When Jace, Alec, Isabelle and Clary manage to find her after Simon gets taken himself by the same vampires, she grows closer to Jace, the only person who stayed by her side through everything. Is it the love of a caretaker or something more?