Stratemeyer initially pitched the new series to Hardy Boys publishers Grosset & Dunlap as the "Stella Strong Stories", adding that "they might also be called 'Diana Drew Stories', 'Diana Dare Stories', 'Nan Nelson Stories', 'Nan Drew Stories', or 'Helen Hale Stories'." Editors at Grosset & Dunlap preferred "Nan Drew" of these options, but decided to lengthen "Nan" to "Nancy". Stratemeyer accordingly began writing plot outlines and hired Mildred Wirt, later Mildred Wirt Benson, to ghostwrite the first volumes in the series under the pseudonym Carolyn Keene. Subsequent titles have been written by a number of different ghostwriters, all under the pseudonym Carolyn Keene.