Columbella — Phyllis A. Whitney

That was a night of gold and red, with torches flaming on the hilltop and the lights of Charlotte Amalie fanning out around the harbor below. A night of water lily and sweet-smelling cereus. The night of the shell...
Jessica Abbott, fleeing her own past, finds herself the center of a whirlpool of conflict at Hampden House, high on its cliff in the Virgin Islands. She is confronted by Catherine Drew, a woman whose sole purpose is to torment and destroy. Catherine is the wife of a vital, driven man, Kingdon Drew-toward whom Jessica is irresistible drawn. Jessica must defy the beautiful, self-indulgent Catherine, who likes to affect the name of a shell - Columbella. She must fight for the very future of another woman's child. Above all, she must find the strength to help the man she loves escape the trap Catherine has set for him. Yet each day Catherine seems to mock her in a new way - and win. Until the night of the shell...
Always, the brilliant island sun shines over Hampden House in St. Thomas and over Caprice, the plantation in St. Croix that is crumbling to eerie ruin, guarded by its unicorns. Always the threat of a hurricane looms over this exotic setting, where the past still affects the present.