From The Encyclopedia of Science Fiction:
Helen Beauclerk was a UK writer and translator, in France much of her life; from 1923 until his death in 1953 she lived with Edmund Dulac. The Love of the Foolish Angel seeks to capture the spirit of the heretical fantasies of Anatole France. It tells of Tamael, who unwittingly attaches himself to the cause of rebellious Lucifer and becomes a fallen Angel by accident; a blatant misfit in Hell, he is dispatched to Earth to tempt human beings to sin, but falls in love with the lovely Basilea and becomes her protector.