Clockwork Angel

In a time when Shadowhunters are barely winning the fight against the forces of darkness, one battle will change the course of history forever. Welcome to the Infernal Devices trilogy, a stunning and dangerous prequel to the New York Timesbestselling Mortal Instruments series.
The year is 1878. Tessa Gray descends into London’s dark supernatural underworld in search of her missing brother. She soon discovers that her only allies are the demon-slaying Shadowhunters—including Will and Jem, the mysterious boys she is attracted to. Soon they find themselves up against the Pandemonium Club, a secret organization of vampires, demons, warlocks, and humans. Equipped with a magical army of unstoppable clockwork creatures, the Club is out to rule the British Empire, and only Tessa and her allies can stop them...

Another amazing book by Cassandra Clare. This is the first book from The Infernal Devices series. It's preferable if you read this series before The Mortal Instruments series but I read TMI before it anw and it didn't spoil anything.
I love everything about this book. Words can't describe how beautiful it is. The characters are so lovable. Sadly I know a huge spoiler about this series. I guess that's why I still didn't read book 2 but
I surely will later.
If you don't know anything about the Shadowhunters world or you haven't read anything for Cassadra Clare this book is for you.
You should totally read it and tell me what you think.