I have just finished reading book three of six in the Mortal Instruments series! I am so in love with this series. So far, there are Shadow hunters, or Nephilim, they are the good guys who hunt down and kill the demons. The books also feature, warlocks, vampires, faeries, and werewolves. Clary Fray is the main character who grew up thinking she was normal, until one day she meets Jace. He is the shadowhunter boy who turns her life around. At one point they find out they are actually brother and sister, after developing a love interest in each other. By the end of book three however, we find that they are not brother and sister, but that Clary's father was experimenting with her Jace and another boy, her real brother, when they were all very little. This story has love, adventure, danger, and will keep you on the edge of your seat. I cannot wait to finish out the series. Oh and they have made book one, City of Bones into a movie as well. I highly recommend watching that after you read the series!