The Infernal Devices 3 Books Set by Cassandra Clare, Titles in this set are Clockwork Angel, Clockwork Prince and Clockwork Princess.

Clockwork Angel

Magic is dangerous - but love is more dangerous still... When sixteen-year-old Tessa Gray arrives in England during the reign of Queen Victoria, something terrifying is waiting for her in London's Downworld where vampires, warlocks and other supernatural folk stalk the gaslit streets. Friendless and hunted, Tessa seeks refuge with the Shadowhunters, a band of warriors dedicated to ridding the world of demons. Drawn ever deeper into their world, she finds herself fascinated by - and torn between - two best friends, and quickly realizes that love may be the most dangerous magic of all.

Clockwork Prince

Love and lies can corrupt even the purest heart... In the magical underworld of Victorian London, Tessa Gray finds her heart drawn more and more to Jem, while her longing for Will, despite his dark moods, continues to unsettle her. But something is changing in Will - the wall he has built around himself is crumbling. Could finding the Magister free Will from his secrets and give Tessa the answers to who she is and what she was born to do? As their search for the truth leads the three friends into peril, Tessa's heart is increasingly torn, especially when one of their own betrays them.

Clockwork Princess

If the only way to save the world was to destroy what you loved most, would you do it? The clock is ticking. Everyone must choose. Passion. Power. Secrets. Enchantment. Danger closes in around the Shadowhunters in the third and final instalment of the bestselling Infernal Devices trilogy