Outgoing Mary (Hayley Mills) and the introverted Rachel (June Harding) cause no end of trouble for the exasperated Mother Superior (Rosalind Russell) in this children's comedy that is fun for all ages. The girls cause comic catastrophes at a religious school run by nuns with some civilian help from teacher Mrs. Phipps (Gypsy Rose Lee). Hollywood legend Ida Lupino directs her first film since the 1953 feature The Bigamist.