Sarah had come home from Paris to be a bridesmaid for her sister Louise. When a child, Sarah had adored her elder sister, but Louise had grown up to be an arrogant, selfish, cold and extravagant woman. She was also breath-takingly beautiful. The man she was to marry, Stephen Halifax, was a successful novelist, very rich and snobbishly unpleasant. From Sarah's first night at home she began to question Louise's motives in this loveless match.

A Summer Bird-Cage is the story of Louise's marriage as seen through Sarah's eyes. It is also the story of a year in Sarah's own life. She is a young woman, intelligent and attractive, just down from Oxford, but completly at loose ends without close friends or a lover. What she discovers about herself is as fascinating as what she discovers about love, infidelity and her sister Louise.