Mary Miley grew up in New York, Pennsylvania, Illinois, and Virginia, and worked her way through the College of William and Mary in Virginia as a costumed tour guide at Colonial Williamsburg.

As Mary Miley Theobald, she has published numerous nonfiction books and articles on history, travel and business topics. As Mary Miley, she is the author of the award-winning Roaring Twenties mystery series. The Mystic's Accomplice is the first in the brand-new 1920s Chicago-set Maddie Pastore mystery series.