The Mortal instruments is a six book series written by Cassandra Clare. These amazing books are about the Shadowhunters of the New York Institute. Shadowhunters are a race of human and angel hybrids which protect the mundane/human world from demons, while also keeping downworlders in line. Downworlders are vampires, werewolves, the fae, and warlocks.
The series, The Mortal Instruments, consists of the following six books, City of Bones, City of Ashes, City of Glass, City of Fallen Angels, City of Lost Souls, and City of Heavenly Fire, in that order. These follow the story of a sixteen year old girl, Clary Fray, living in New York and her discovery of the shadow world. After being hidden from it, Clary Fray is thrust into this world and discovers that she is a shadowhunter. Anywhere she goes so does her best friend, Simon Lewis, who is also thrown into this world but as a mundane. They meet the golden boy, Jace Wayland, and his adoptive family, the Lightwoods, who are also shadowhunters in the New York Institute. Together Jace, Clary, Simon, Isabelle and Alexander Lightwood need to find the mortal cup and stop Valentine from accomplishing his evil goal. Secrets and lies are revealed that just might break even the best of the shadowhunters.
If you like to read fantasy, this series is definitely recommended.