Patricia and Isobelle O'Sullivan arrive at St. Claire, a college for girls, to begin their studies and settle into their new home. There, they meet Alison, Wella, Catherine, and Doris, who also reside at St. Claire, and the group quickly bonds in team spirit. Together, the girls enjoy games and long periods of fun, living in harmony until Winfred appears. A sulky, rude, and antisocial girl, Winfred has no doubt about creating all kinds of trouble for the O'Sullivan twins and their friends.