Clemence Dane 
Regiment of Women [EPUB ebook] 

Set in a small town in Edwardian England, Regiment of Women is about the relationship between two teachers at a private (and elitist) girls’ school. One of them, Clare Hartill, is in her mid-thirties and runs the school in all but name, the ageing and sickly headmistress depending on her whenever a decision has to be taken concerning the school or any of its pupils. Most of the girls are devoted to Hartill and gladly suffer under her strict but charismatic rule and the loads of homework she sets them, mainly to prove to her and to themselves that they are more academically advanced than she told them they were. Hartill lives alone near the school in a small, old-fashioned flat full of books but without gas or electricity. (Excerpt from Wikipedia)