Pseudonym of Constance Lindsay Dowdy. She was born in Dovercourt, Essex. In 1928 she started her writing career with poems, stories and articles for several periodicals. In 1930 she married and her writing disappeared into the background. In 1948 her first crime novel appeared, Murder with Relish.
Four years later, with her children grown up, she spent more time on writing. The director of her publishing firm decided to publish her novels under the male pseudonym of 'Guy Cullingford'. Her real identity became known after she joined the 'Detection Club', 'Crime Writers Association' and 'Writers Guild of Great Britain'.