In the novel The Moving Finger, Mary Grey is the dressmaker of Joanna Burton in London. She is described as an "unconventional and breezy woman of forty-five". Jerry Burton also says that she is a clever woman, and very good company. He asked her to dress her up Megan Hunter, which she did. She also brought Megan to Joanna's hairdresser.
She uses the name Mirotin professionally.