Three generations of the Trenchard family, ruled over by the indomitable Mrs Trenchard, live together in comfortable domesticity until Katherine, the favourite daughter, meets and falls in love with Philip, back from some years in Russia, who threatens the whole stability of the family set up by thinking that he can marry her and thus take her away from them all. Philip and Katherine agree reluctantly to postpone their marriage for a full year. During this year, the family begins to splinter as more about Philip and his past becomes known.
With considerable humour, the book follows the ups and downs of the family relationships as the year progresses.