Wardstone Chronicles / Last Apprentice
1. The Spook's Apprentice (2004)
     aka Revenge of the Witch
2. The Spook's Curse (2005)
     aka Curse of the Bane
3. The Spook's Secret (2006)
     aka Night of the Soul Stealer
4. The Spook's Battle (2007)
     aka Attack of the Fiend
5. The Spook's Mistake (2008)
     aka Wrath of the Bloodeye
6. The Spook's Sacrifice (2009)
     aka Clash of the Demons
7. The Spook's Nightmare (2010)
     aka Rise of the Huntress
8. The Spook's Destiny (2011)
     aka Rage of the Fallen
9. I Am Grimalkin (2011)
     aka Grimalkin, the Witch Assassin
10. Spook's Blood (2012)
The Spook's Tale (2009)

World Book Day 2009 (with Mark Walden)
The Spook's Tale / Interception Point (omnibus) (2009)

Spook's Stories
Witches (2009)
     aka A Coven of Witches
The Spook's Bestiary (2010)
Grimalkin's Tale (2011)

Mercer's Whore (1997) (writing as J K Haderack)
Slither (2012)

Haunted (2011) (with Susan Cooper, Berlie Doherty, Jamila Gavin, Matt Haig, Robin Jarvis, Derek Landy, Sam Llewellyn, Mal Peet, Philip Reeve and Eleanor Updale)