"Secrets aren't secrets, they are weapons. You can save them in your pocket until you need them" - A. Alec, Magnus, Jace, Simon, Izzy, Clary and Jonathan were best friends all their lives. But in their last year of high school Jonathan goes missing and is found murdered leaving the group devastated. Things become dangerous when the group starts receiving texts threatening their secrets from the elusive J. When Alec is blamed for Jonathan's murder and almost sent to prison because of it, the group vow to find out who really killed Jonathan to save Alec from those still determined to pin the blame on him and to gain justice for Jonathan.