Mary and her friend, Rachel, are new students at St. Francis Academy, a boarding school run by the iron fist of Mother Superior. The immature teens grow bored and begin playing pranks on both the unsuspecting nuns and their unpleasant classmates, becoming a constant thorn in Mother Superior's side. However, as the years pass, Mary and Rachel slowly mature and begin to see the nuns in a different light.

Hayley Mills
as Mary Clancy

June Harding
as Rachel Devery

Rosalind Russell
as Mother Superior

Binnie Barnes
as Sister Celestine

Camilla Sparv
as Sister Constance

Mary Wickes
as Sister Clarissa

Marge Redmond
as Sister Liguori

Dolores Sutton
as Sister Rose Marie

Margalo Gillmore
as Sister Barbara

Portia Nelson
as Sister Elizabeth
Wuchak
_**A couple of troublemaking girls at a Catholic school/nunnery**_ Mary (Hayley Mills) is sent to a Catholic school in Pennsylvania where she constantly causes problems along with her “follower” Rachel (June Harding). Can Mother Superior (Rosalind Russell) & the other nuns tame these troublemaker...