Sheer Chance — Suzanne Goodwin

Avril Brett has opted out of the sexual revolution and settled into a loveless marriage and a dead-end job. Dominated by her husband, who has been having affairs since six months into their marriage, when he is posted to St Vincent, she has a brief affair with her boss. She discovers previously unknown depths of her soul, and becomes pregnant. When her husband finds out, they separate, but that is just the beginning of Avril's fulfilling new life.