The success of Harriett's short stories prompted her to write the now-famous Five Little Peppers series. This series was first published in 1881, the year that Stone married Daniel Lothrop. Daniel had founded the D. Lothrop Company of Boston, who published Harriett's books under her pseudonym, Margaret Sidney. Harriett and Daniel may have both had an interest in history and in famous authors. In 1883, they purchased the house in which both Louisa May Alcott and Nathaniel Hawthorne lived. Nicknamed The Wayside, the house is located in Concord, Massachusetts.