A recommendation rather than a review:
The Doctor’s Wife, first published in 1976, is the story of Sheila Redden, aged 37, who meets a younger man on a holiday in France. Sheila is somewhat reminiscent of Mary Dunne, but stronger and more controlled. Where Mary Dunne felt defined by the men she married, Sheila Redden does not.
Throughout the story, we learn about Sheila, but also, and possibly more so, about her husband (opinions vary). Sheila has one child, a teenage boy. The story is smoothly told from three points of view: Sheila’s, her husband’s, and her brother’s. We do not directly hear from the lover or the son, but we can certainly feel for them.