Chapter one: A demon's internal attack

Jace wayland fought a demon and it manifested itself in him and consumes all the violence and resentment in his heart and then split creating a second Jace known as Jase. The love of Jace's life, a vampire and former shadow hunter ironically named Valentine has a shadow hunter sister named Alexis and she may be the only one that can contain the madness that is Jase with the help of Simon, Isabelle, Magnus, Jace, Alexis, and Alec.