The Prime of Miss Jean Brodie by Muriel Spark

The Prime of Miss Jean Brodie is about an unorthodox teacher in 1930s Edinburgh who amusingly and dangerously influences six girls aged 10 to 12 in a private school. They are called the Brodie set and they are each famous for something. The conflict comes when one of the girls, Sandy, breaks the mold when she comes of age and betrays Ms. Brodie's confidence in a final act of defiance.