Yesterday's Tears — Susannah Leigh

SISTERS UNDER THE SKIN
Faith Eliot came from England to the South Carolina plantation of Havenhurst to find out the truth about the mysterious death of her twin sister, Fleur. But when she arrived, she could feel Fleur's spirit come alive -- within herself.

No longer was Faith the shy creature so very distant from her irrepressible, insatiable twin. She felt Fleur's power over men becoming hers, she felt Fleur's burning needs. Handsome, powerful Brad Alleyn and elegant, sophisticated Alexandre Rochforte both were eager to possess her, just as they had Fleur--and Faith could no more deny their hungers than she could her own. In all innocence, Faith had entered her sister's world of divided love-and darkest danger.