Take two sisters, Alice and Flora Mayor, identical twins born into a comfortable upper-middle-class family in Surrey in 1872. Their clergyman father was also a professor of classical literature at King’s College, London, and their mother Jessie a talented musician and linguist. As members of a Victorian clerical family, the girls had certain duties (‘Church as depressing as usual. 2 and a half people there,’ young Flora wrote in her diary), but mostly they and their two older brothers had tremendous fun: performing amateur theatricals, skating and playing tennis, singing, writing stories, going to the theatre, and always, always reading: Jane Austen, the Brontë sisters and Mrs Gaskell.