Little Prudy's Sister Susy is a tale of Susy Parlin, the oldest of the three little Parlin girls, and completely different from a young and reckless Prudy, who always gets in trouble. Behind the scenes of Prudy's adventures hides a charming little tale of Susy's experiences during Christmas and New Year holidays.

Rebecca Sophia Clarke (1833-1906), also known as Sophie May, was an American author of children's fiction. Clarke was called "the Dickens of the nursery". The children in her books were often naughty and uninhibited. She was one of the first authors to write stories for children that depicted them realistically with all their humor, imagination and mischievousness. Her most successful stories were those of the Little Prudy series. Clarke's nieces were the inspiration for her characters: Prudy, Susy, and Dotty Dimple.