The Twins at St Clare's is a children's novel by Enid Blyton set in an English girls' boarding school.

The twins miss their favourite sports of field hockey and tennis because only lacrosse is played at St Clare's.

Janet, a sarcastic and blunt student, leads the year in a series of pranks against their new History teacher Miss Kennedy, who is very timid and insecure though highly qualified.

Janet continues to play pranks on the teachers, such as hiding a cat in Miss Kennedy's room due to her known phobia.

However, one day Kathleen and the twins overhear her talking to a friend about giving up her job, despite needing the money to help her sick mother, because she cannot control the class.

She is eventually made prompter at the Christmas play and Janet is advised by head girl, Winnifred not to exploit Sheila's insecurities.