These Shallow Graves by Jennifer Donnelly

Jo Montfort lives a life of privilege in New York City during the Gilded Age.  For a young woman of her background, this means finishing her education at an elite, private academy and marrying a young man with an equivalent pedigree.  However, Jo is not like her friends; she loves to write and in her dreams she becomes the next Nellie Bly--a famous journalist.  When her father commits suicide, Jo is forced to face her future.  Does she marry her family's choice and assume her rightful place in society or does she start investigating her father's suspicious death  at the risk of ruining her reputation and, possibly, losing her life.  This mystery combines a complex and gripping plot with  glimpses of life amongst both the very rich and very poor in 1890's New York.  Author Donnelly seasons the story with romance, as Jo is drawn to a reporter, whom her family would never accept.  Great stuff.