To save her mother's life, Clary must travel to the City of Glass, the ancestral home of the Shadowhunters - never mind that entering 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 Shadowhunter Sebastian. With Valentine mustering the full force of his power to destroy all Shadowhunters 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?
“There is no pretending," Jace said with absolute clarity. "I love you, and I will love you until I die, and if there is life after that, I'll love you then.”
“People aren't born good or bad. Maybe they're born with tendencies either way, but its the way you live your life that matters.”
“I was thinking about the first time I ever saw you," he said, "and how after that I couldn't forget you. I wanted to, but I couldn't stop myself. I forced Hodge to let me be the one who came to find you and bring you back to the Institue. And even back then, in that stupid coffee shop, when I saw you sitting on that couch with Simon, even then that felt wrong to me - I should have been the one sitting with you. The one who made you laugh like that. I couldn't get rid of that feeling. That it should have been me. And the more I knew you, the more I felt it - it had never been like that for me before. I'd always wanted a girl and then gotten to know her and not wanted her anymore, but with you the feeling just got stronger and stronger until that night when you showed up at Renwick's and I knew.”
“Did you ever think that in a past life Alec was an old woman with ninety cats who was always yelling at the neighborhood kids to get off her lawn? Because I do...”
“You can only push the truth down for so long, and then it bubbles back up.”