City of Bones is a great book from my perspective. The 4 people you see are the main characters in this book the girl with the orange hair is Clary Fray the main character her life is so messed up her mom goes into a very deep sleep and found not to live then her Uncle Luke isn't her Uncle. The next person beside her is Simon he was Clarys best friend since forever. Jace is her so called brother and crush. And Valentine the bad guy of the story.
City of Fallen Angels
Simon is a vampire in this book Raphael bite him because he was in the institute. also sadly Valentine is still here. R.I.P. Silent brothers when Valentine went to go see Jace he had to kill one of the Silent brothers sadly it was brother Jeremiah.
City of Lost Souls
Yes sadly Jace does die but he comes back to life again with the help of Magnus Bane. Also Valentine finally dies when Clary stabs Valentine from Valentine killing Jace but also they half to bring back a ancient demon to bring Jace back but in the process of doing this a new character Sebastian is Valentines son and Jace and Clary found out they are not brother and sister.