After 20 years of comfortable marriage, and with the kids finally off her hands, Sarah Lewis realises she has filled the washing machine once too often. Surely there must be more to life than this? What she wants is an adventure - a wild, unpredictable adventure - but her husband, good old reliable David, is very happy with the status quo. What Sarah needs is a gap year for grown-ups - and she wants to do it alone. Confident the grass...