Murder at Marble House : a gilded Newport mystery / Alyssa Maxwell.

Enhanced descriptions from Syndetics:

For fans of HBO's The Gilded Age , explore the dark side of the alluring world of America's 19th century elite in this gripping series of riveting mysteries...

With the dawn of the twentieth century on the horizon, the fortunes of the venerable Vanderbilt family still shine brightly in the glittering high society of Newport, Rhode Island. But when a potential scandal strikes, the Vanderbilts turn to cousin and society page reporter Emma Cross to solve a murder and a disappearance. . .

Responding to a frantic call on her newfangled telephone from her eighteen-year-old cousin, Consuelo Vanderbilt, Emma Cross arrives at the Marble House mansion and learns the cause of her distress-Consuelo's mother, Alva, is forcing her into marriage with the Duke of Marlborough. Her mother has even called in a fortune teller to assure Consuelo of a happy future.

But the future is short-lived for the fortune teller, who is found dead by her crystal ball, strangled with a silk scarf. Standing above her is one of the Vanderbilts' maids, who is promptly taken into police custody. After the frenzy has died down, Consuelo is nowhere to be found. At Alva's request, Emma must employ her sleuthing skills to determine if the vanishing Vanderbilt has eloped with the beau of her choice-or if her disappearance may be directly connected to the murder. . .