Down to her last dime and offered the chance of a job of a lifetime at The New York World, twenty-three-year old Elizabeth Cochrane agrees to get herself admitted to Blackwell's Island Lunatic Asylum and report on conditions from the inside. But what happened to her poor friend, Tilly Mayard? Was there more to her high praise of Dr Frank Ingram than everyone knew?

Thirty years later, Elizabeth, known as Nellie Bly, is no longer a celebrated trailblazer and the toast of Newspaper Row. Instead, she lives in a suite in the Hotel McAlpin, writes a column for The New York Journal and runs an informal adoption agency for the city's orphans.

Beatrice Alexander is her secretary, fascinated by Miss Bly and her causes and crusades. Asked to type up a manuscript revisiting her employer's experiences in the asylum in 1887, Beatrice believes she's been given the key to understanding one of the most innovative and daring figures of the age.