Isabelle, the Frantic — Katheryn Kimbrough

Since the mysterious death of Elena, her identical twin sister, beautiful young Isabelle Phenwick no longer knew who she really was, or what sinister surprise lay in wait for her each day of dread and night of menace. For Isabelle felt herself becoming two very different women - one, the proper young lady she had always been; the other, a ruthless wanton driven by greed and inflamed by animal passion. Which one of these two contending halves of her would win control of the whole of her? What diabolical spell enveloped her? Fearful questions...terrifying answers...as Isabelle faced the most horrifying nightmare a Phenwick woman had ever known - and plunged into the most searing battle any woman ever fought against herself.