An Unbreakable Bond (1986)

Bound to each other by passion ... Eliot Buchanan was outraged to think that his late uncle's mistress would inherit a large share of the family's New Zealand estate. And as executor of the will he planned to do everything in his power to contest her claim. For the most part Tiffany could understand Eliot's obvious contempt for her. But she was confused by the passionate desire he was capable of arousing in her. Suddenly it became overwhelmingly important that Eliot learn the truth about his uncle--even if it meant jeopardizing her own happiness.