William Fryer Harvey (1885-1937) was an English writer of short stories, most notably in the mystery and horror genres.
Born into a wealthy Quaker family in Yorkshire, he went to Balliol College, Oxford, and took a degree in medicine at Leeds. Ill health dogged him, however, and he devoted much of his recuperation to writing short stories.
Double Demon is the tale of a young man who is planning a murder. He tells two women of his plans: his sister, Isobel; and her nurse and companion, the beautiful Judith. But he tells Isobel that he is planning to murder Judith and tells Judith that it is Isobel he will kill.
But what are his real plans? How will the two women respond? What will be the outcome of his elaborate preparations? Sheer suspense!