- Author: The Duchess of Northumberland Author Record # 137912
- Legal Name: Percy, Isobel Jane Miller
- Birthplace: Edinburgh, Midlothian, Scotland, UK
- Birthdate: 11 May 1958
- Language: English
- Webpages: poisondiaries.com, Wikipedia-EN
- Used These Alternate Names: Jane Northumberland
- Author Tags: young-adult fantasy (3)
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Novels
- The Poison Diaries (2010) with Maryrose Wood
- The Poison Diaries: Nightshade (2011) with Maryrose Wood
- Weed (2013) with Hugh Sington