Brief Enchantment — Susanna Collins

He was a seventeenth-century rogue, a plotter of intrigues, a seducer of women, and a literary luminary -- and Sandy O'Sullivan is half in love with him. Until she confronts his modern-day descendant, Antoine de Lusignan, a marquis and a millionaire, whose virile presence is infinitely more compelling...

But Antoine wants nothing to do with his illustrious ancestor and threatens Sandy's doctoral dissertation by refusing her access to his private library. Though he offers delightful sensual compensation, Sandy shrewdly resists...until she's caught up in an irresistible spell, captivated by tales of mystical mermaids, idylls in enchanted forests, and a passion that penetrates the mists of time...