

Inspired by a childhood immersed in fairy tales, most of her books feature the supernatural and The Fair Folk. Not always portrayed so positively, either—the supernatural creatures in her stories are usually of the cruel, vindictive, yet terribly beautiful variety. Her young adult works also have a generous helping of Body Horror and Gorn.
She's good friends with Cassandra Clare, and the two of them have worked on a joint project The Magisterium.
Works with their own pages:
- The Coldest Girl in Coldtown
- The Curse Workers
- White Cat
- Red Glove
- Black Heart
- The Darkest Part of the Forest
- Geektastic: Stories from the Nerd Herd
- The Good Neighbors
- "Lights Out" in 12 Doctors 12 Stories
- The Folk of the Air
- The Cruel Prince
- The Wicked King
- The Queen of Nothing
- The Magisterium (co-written with Cassandra Clare)
- The Iron Trial
- The Copper Gauntlet
- The Bronze Key
- The Silver Mask
- The Golden Tower
- Modern Faerie Tales
- Tithe
- Valiant
- Ironside
- The Spiderwick Chronicles
- Zombies vs. Unicorns
Her works contain examples of:
- The Fair Folk: Fairies in her books are dangerous, tricky beings who operate on Blue-and-Orange Morality, with many being outright malicious.