Williams, K. (2022) The suffragette cookbook introduction. In: The Suffragette Cookbook. Hodder Studio, London. ISBN 9781529394153

Williams, K. (2020) Emma Hamilton & Admiral Lord Nelson. In: Peltz, L. and Stewart, L. (eds.) Love stories: art, passion & tragedy. National Portrait Gallery, pp. 150-156. ISBN 9781855147034

Williams, K. (2019) Rival queens: the betrayal of Mary, Queen of Scots. Arrow, pp408. ISBN 9780099549734

Williams, K. (2018) The house of shadows. De Witt chronicles. Orion Publishing, London, pp425. ISBN 9781409139959

Williams, K. and Colville, Q. (2016) Emma Hamilton: seduction and celebrity. Thames & Hudson, pp288. ISBN 9780500252208

Williams, K. (2016) Introduction. In: Sackville-West, V. (ed.) The Edwardians. Vintage. ISBN 9781784870546

Williams, K. (2015) The edge of the fall. Orion, London. ISBN 9781409139911

Williams, K. (2014) The storms of war. Orion. ISBN 9781409139881

Williams, K. (2013) Josephine: desire, ambition, Napoleon. Hutchinson. ISBN 9780091936914

Williams, K. (2012) Young Elizabeth: The Making of Our Queen. W&N.

Williams, K. (2011) The Ring and The Crown: A History of Royal Weddings. Hutchinson, pp189. ISBN 978-0091943776

Williams, K. (2011) The Weakness of Hearts. Litro, 104.

Williams, K. (2011) Introduction to Frederick the Great by Nancy Mitford (Vintage, 2011). In: Frederick the Great. Vintage. ISBN 978-0099528869

Williams, K. (2011) The Pleasures of Men (A Novel). Penguin.

Williams, K. (2010) The Rise of the Novel. In: The History of British Women's Writing 1690–1750. AIAA. ISBN 978-0230549388

Williams, K. (2008) Becoming Queen. Hutchinson.

Williams, K. (2007) Passion in Translation: 1720s Amatory Writers and the Novel. In: Remapping the Rise of the Novel. Voltaire Foundation.

Williams, K. (2005) "Nelson and Women" in Admiral Lord Nelson: Context & Legacy. In: Admiral Lord Nelson: Context & Legacy. AIAA. ISBN 978-1403939067

Williams, K. (2005) Reading Tristram Shandy in the Brothel. The Shandean (16).

Williams, K. (2004) The Force of Language and the Sweets of Love: Eliza Haywood and the Erotics of Reading in Samuel Richardson's Clarissa. Lumen, 23. pp. 309-323.

Williams, K. (2001) England's Mistress: The Infamous Life of Emma Hamilton. Hutchinson.