A Summer Bird-Cage by Margaret Drabble

In her witty, masterful debut novel, Margaret Drabble conjures a gripping story of sibling rivalry. Louise, beautiful and sophisticated, marries wealthy novelist Stephen Fairfax. Sarah, recently graduated from Oxford, is thrown back into family matters. Louise's life becomes one of parties, gossip columns and glamour. Sarah, now in London, begins to discover a newfound freedom, only glimpsing her sister's fashionable life. But as rumours of infidelity in Louise's marriage surface, Sarah finds that her sister, beneath her cool exterior, may not be the woman she thought she was. 'Margaret Drabble's early novels were intimate and sprightly chronicles of the small dissatisfactions and small triumphs of young women like herself' - Hilary Mantel