- 17 April 2016
- BBC News
She is described as slim and with long black hair. It is not known what she was wearing at the time disappeared.
Police want help tracing the Northumberland-born author, known for the Electra Brown series for teenagers.
She is also known for a blog which she began writing after her husband drowned while the couple were on holiday in Barbados in 2011. The blog, Planet Grief, was later turned into a book.
She has connections to Kent, London and around her home village of Ponteland in Northumberland, Hertfordshire Police said.
Anyone who knows of her whereabouts is asked to call the non-emergency number 101.