The book series 'The Mortal Instruments' contains 4 books . City of Bones the first one, City of Ashes the second one, City of Glass the third book and the upcoming one being City of Fallen Angels, author Cassandra Clare.
It follows the life of Clary Fray, when at a club, Pandemonium, that is located in New York city where she lives, she witnesses a strange murder that is committed by mere teenagers with bizzare weapons and tattooes on their body. Clary of course wanting to report this murdur finds it hard to do when she realizes no one would believe her when only she can see the murders and especially since the evidence (the body) disappears into thin air before her.
Suprised to the fact that Clary could see them, the teens explain that they are Shadowhunters, a secret society of hunters that dedicates their lives to ridding the Earth of demons. But as the hours pass by Clary realizes that she has bigger problems to deal with, but is still somehow connected to these Shadowhunters.
Clary's mom goes missing when she returns to her apartment to find it totally destroyed and a demon lurking about it ready to attack her. But what does demons want with ordinary humans (mundanes) like her and her mother. And why can she see these so called Shadowhunters and no one else can? On this amazing new adventure Clary finds herself on, she discovers a world she never knew existed, while also finding love with her new comrade and friend Jace, causing the development of a love triangle with she, Jace and her best friend Simon, who has been inlove with her since like forever.
NB: Jace is super funny, lets just say he adds all the comedy, my favourite character i must say :)