This series has six books: 1-City of Bones, 2-City of Ashes, 3-City of Glass, 4-City of Fallen Angels, 5-City of Lost Souls and 6-City of Heavenly Fire.
The Mortal Instruments is the story of a race called Nefilim and their war with the demons (werewolves, vampires, warlocks, etc.) This Nefilim are trained in places that are both their homes and their schools. One girl, named Clary, that is supposedly a mundane (a simple human), sees the slaughter of a vampire by hands of three Nefilim. From that moment, her life is going to change, she is going to live many adventures and she’ll have to deal with a lot of dangerous situations; but she won’t be alone, Jace, Alec, Isabelle (the three Nefilim) and Simon (her bestfriend) will be with her.
I recommend very much this books. The reality and the fiction are, perfectly, combined making you want to become another character of the books. It keeps your attention always and it’s very exciting. Besides, it talks about the importance of friendship, loyalty, bravery, love, etc. Not only romantic love, family love and love to your race.
All its characters are, perfectly, defined and are important to the story. I didn’t had any disappointment reading this books. They’re part of my favorites.