Catherine Webb's first novel, Mirror Dreams, was published when she was 14 years old. Her works so far consist of:
- The Mirror duet, Mirror Dreams and Mirror Wakes;
- The Waywalkers duet, Waywalkers and Timekeepers;
- The Horatio Lyle cycle, The Extraordinary and Unusual Adventures of Horatio Lyle; The Obsidian Dagger, Being the Further Extraordinary Adventures of Horatio Lyle, The Doomsday Machine: Another Extraordinary Adventure of Horatio Lyle and The Dream Thief.
She has now begun a new series under the pen name Kate Griffin; it currently consists of three books, A Madness of Angels, The Midnight Mayor, and The Neon Court.