In Cassandra Clare’s novel City of Bones, Clary Fray is just an average girl living in New York city until she witnesses a boy getting murdered by three teenagers covered with intricate tattoos and carrying bizarre weapons. Clary wants to go to someone about the murder, but the body mysteriously disappears out of thin air and she is the only person who can see the strange teenagers. What Clary soon finds out is that these teenagers are Shadow Hunters, warriors whose job is to hunt down and kill demons, and to keep a watchful eye on the other creatures that go bump in the night. Soon events take a turn for the worst when Clary herself is attacked by a demon and her mother is kidnapped and placed into a magically induced coma.
Clary can’t understand why any of this is happening -- she is just a normal girl with an average life, and nothing strange had ever happened until she met the Shadow Hunters. But, what she soon finds out is that there are secrets about her past and events that have been wiped from her memory. Now, she needs the Shadow Hunters to remember her past and rescue her mother just as much as they strangely need her to defeat the malicious Valentine, a powerful Shadow Hunter who has turned against his own kind.