City of Glass is the third book in The Mortal Instruments trilogy by Cassandra Clare. Spoilers ahead, don't read if you haven't read the first two books!
Summary from Barnes and Noble:
To save her mother's life, Clary must travel to the City of Glass, the ancestral home of the Shadowhunters — never mind that enter-ing the city without permission is against the Law, and breaking the Law could mean death. To make things worse, she learns that Jace does not want her there, and Simon has been thrown in prison by the Shadowhunters, who are deeply suspicious of a vampire who can withstand sunlight.
As Clary uncovers more about her family's past, she finds an ally in mysterious Shadow-hunter Sebastian. With Valentine mustering the full force of his power to destroy all Shadow-hunters forever, their only chance to defeat him is to fight alongside their eternal enemies. But can Downworlders and Shadowhunters put aside their hatred to work together? While Jace realizes exactly how much he's willing to risk for Clary, can she harness her newfound powers to help save the Glass City — whatever the cost?
I was so excited to get this book, since I loved the first two! It didn't disappoint. The characters are great, the plot is exciting, and the tension between Clary and Jace is amazing. There are a few new characters in this one, and it was awesome to see everything fall into place and all the pieces of the story come together. Even though I was pretty busy while reading this book, I still had a hard time putting it down to face my adult responsibilities!
Can I just say HALLELUJAH...Jace and Clary are NOT siblings. I figured this had to happen, but I was VERY happy that the truth finally came out. Even though I suspected a few things before they happened, I still thought it was a great book.
I'm very sad to see this series come to an end!!