Augusta, the Second(1979)
(Book 28 in the Saga of the Phenwick Women series)
A novel by Katheryn Kimbrough
Augusta had been the first and foremost of the Penwick women--but now, generations later, there was another Augusta rising to rival her in the fabulous family. Young and vibrant, this second Augusta was eager to test the powers of her beauty and brains, and hungry for all that life and love could offer. But little did she dream onto what dangerous paths her impatient desires would lead her, and what terrifying treachery lay in wait, as she found herself alone and afraid in a city of intrigue and evil, hunted by a nightmare stalker who well might be the man she adored. Never had there been a more fiery Phenwick woman than the new Augusta--or one threatened by so fearfully fiendish a foe....
Used availability for Katheryn Kimbrough's Augusta, the Second
October 1979 : USA Mass Market Paperback