Cover of the Jacqueline Winspear book The Comfort of Ghosts which shows a woman in a sort of detective outfit standing in front of a window overlooking the city of london (I think) looking into a picture which is of herself, probably, dressed as a nurse which is how this series began.
https://cdn.masto.host/glammrus/media_attachments/files/112/967/187/034/906/292/original/631646fabf67f71a.jpeg