Rich Man by Laura Landon

A self-made man set on revenge and a beautiful heiress, stunned by the magnetism that neither wants to acknowledge, attempt to bridge the gulf between tradesman and nobility. Without ruining each other.
Wealthy importer Blake Edison will stop at nothing to destroy the Duke of Somerset—the man who should have saved Edison’s mother from starving in the streets and didn’t. But can he fulfill his diabolical mission without losing Willow? That is, without losing Lady Willow Gilchrist, the gifted beauty who is about to become the Duke’s daughter-in-law?