If you enjoyed Harry Potter and/or Twilight than these books are for you. The series is written by Cassandra Claire (I think!) and the books are the City of Bones, City of Glass, and City of Ashes.
Like Harry Potter and Twilight there is magic in these books. To be exact there are wizards, elves, vampires, werewolves, faeries and Shadow Hunters which are a race of humans who carry angelic blood. It is their duty to rid the world of the demons and maintain a balance.
Clary, the main character is a normal girl who gets sucked into this world of the supernatural when her mother disappears. It is then that Clary finds out that she is much more connected to this world than she ever knew. She along with her best friend Simon and her new Shadow Hunter friends Alex, Isabelle and Jace have to work together to find and rescue Clary's mother. Only it is through this journey that Clary begins to learn more about her past, her mother's past and who her father really is. There are secrets and mysterious that threaten to tear apart her relationships with the ones closest to her.