What is the setting of A Monstrous Regiment of Women by Laurie R. King?

The novel is set primarily in London during the end of 1021 and the beginning of 1922. The novel seems to cover the years between 1952 and 1955. The main characters of the novel are in the investigation the deaths of the women members of the Temple that die under mysterious circumstances and are wealthy enough to live substantial money and assets to the Temple.