Caspary returned to New York after Igee's death, where she published eight more books, including "The Rosecrest Cell", a study of a group of frustrated amateur Communists; and the memoir "The Secrets of Grown-ups". None equaled the popularity of her early suspense work. In her 18 published novels, 10 screenplays and four stage plays, Caspary's main theme, whether in a murder mystery, drama or musical comedy, was the working woman and her right to lead her own life, to be independent. Caspary died of a stroke at St. Vincent's Hospital in New York City in 1987.