This is book number 1 in the Mortal Instruments series.
Right away you are whipped into a secret world of demons, runes, and seraph blades. From the point of view of a regular mundane teenage girl, you will learn about the hidden life of shadowhunters and the danger that follows them. This series holds the best intense fight scenes, groundbreaking disasters, family tragedies, unbreakable bonds, and of course the magical creatures that will captivate you into the shadowhunter world and make you never want to leave. — Skye, Chicago ORD