Isannah is the youngest Lapham sister. According to her mother Mrs. Lapham, due to her being so sickly, Isannah is barely worth the bother to raise. However, Isannah is beautiful, with blond hair and pink cheeks. Cilla , Isannah’s older sister, adores Isannah and takes on most of Isannah’s care. From a young age, Isannah learns to perform for people on the streets, often religious figures, who are happy to give such an angelic-looking child sweets or her favorite limes in exchange for her reciting Bible verses. Johnny sees that this unattractive habit balloons once Miss Lavinia Lyte takes an interest in Isannah and takes the eight-year-old to live with her. The Lytes treat Isannah like a doll. Isannah goes everywhere with Miss Lavinia and learns quickly to look down on people of lower classes—including Johnny, whom she once adored. Ultimately, Isannah decides to go to London with Miss Lavinia, where she’ll train as an actress. The novel frames Isannah’s decision as the final step of Isannah’s moral downfall: where Johnny learned to control his prideful impulses, Isannah learns to give in to hers.