Monica Randall grew up on the Gold Coast of Long Island and was fascinated by the massive estates and their tantalizing stories. Millionaire F. W. Woolworth built Winfield, the grandest of its manors in the 1910s. On a clear day, you can see the New York City skyline from its balustraded roof, yet for nearly a century few have been allowed to enter its gates. In the 1960s Monica was living in one of the fabled mansions built by a Five-and-Dime heiress...