Before the War by Fay Weldon

A novel of love, death and aristocracy in twenties London.

Consider Vivien in November 1922. She is twenty-four, and a spinster. She wears fashionably droopy clothes, but she is plain and – worse – intelligent. Fortunately, Vivien is rich, so she can bribe a man to marry her. What nobody knows is that Vivien is pregnant, and will die in childbirth in just a few months...