Annie Haynes was born in Ashby-de-la-Zouch, Leicestershire, UK, in 1864. After her father abandoned the family, she lived with her grandparents, mother and brother on the country estate of Coleorton Hall in Leicestershire, where her grandfather Montgomery Henderson was the landscape gardener.

After her mother's death in 1905 she moved to London, where she lived with a friend, Ada Heather-Bigg. Interested in detective novels and subjects related to crime and criminal psychology, Haynes visited murder scenes and attended trials.

Her first novel, The Bungalow Mystery, was published in 1923, but she had already had several long stories serialised in newspapers, some of which were published as books later. The last of her twelve novels, The Crystal Beads Murder, published after her death, was completed by an anonymous writer.

Haynes died in 1929, having suffered from crippling rheumatoid arthritis for some fifteen years.

From Wikipedia