A Modern Tomboy is a story about two young girls, Rosamund Cunliffe and Irene Ashleigh, who are very different from each other. Rosamund is a beautiful, kind, and intelligent girl, while Irene is a tomboy who loves to climb trees and play with boys. When the two girls are forced to share a room at Sunnyside School, they must learn to get along despite their differences. Rosamund is initially annoyed by Irene's boisterous behavior, but she soon realizes that Irene is a kind and caring person. Irene, on the other hand, is initially intimidated by Rosamund's beauty and popularity, but she soon comes to admire Rosamund's intelligence and kindness. As the two girls get to know each other better, they become close friends. They learn to appreciate each other's strengths and weaknesses, and they help each other to grow and mature. A Modern Tomboy is a heartwarming story about friendship, acceptance, and the power of love.