City of Ashes by Cassandra Clare

Clary Fray just wishes that her life would go back to normal. But what's normal when you're a demon-slaying Shadowhunter, your mother is in a magically induced coma, and you can suddenly see Downworlders like werewolves, vampires, and faeries? If Clary left the world of the Shadowhunters behind, it would mean more time with her best friend, Simon, who's becoming more than a friend. But the Shadowhunting world isn't ready to let her go — especially her handsome, infuriating, newfound brother, Jace. And Clary's only chance to help her mother is to track down rogue Shadowhunter Valentine, who is probably insane, certainly evil — and also her father.
To complicate matters, someone in New York City is murdering Downworlder children. Is Valentine behind the killings — and if he is, what is he trying to do? When the second of the Mortal Instruments, the Soul-Sword, is stolen, the terrifying Inquisitor arrives to investigate and zooms right in on Jace. How can Clary stop Valentine if Jace is willing to betray everything he believes in to help their father?
In this breathtaking sequel to City of Bones, Cassandra Clare lures her readers back into the dark grip of New York City's Downworld, where love is never safe and power becomes the deadliest temptation. From Goodreads.

I am enjoying this series, it is very clearly young adult but still good. I have ordered the next book from the library. 

This book qualifies for:
Goodreads Reading Challenge 2015
I love Library books 2015
Romance Readers Reading Challenges: Word Hunt 2015
Wacky Reading Challenges: Word Search 2015
The Challenge Factory: Scavenger Hunt Part XVI
Rawk-A-Tiers: Scavenger Hunt
A Million More Pages: Scavenger 2015 
A Million More Pages Hogwarts: Pick One For Me
A Million More Pages Hogwarts: Dragon Nursery
Crazy Challenge Connection: Pick a Theme 2015-2016
Wacky Reading Challenges: Vampires, Witches & Ghosts, O My