You might like 'Fatal Attraction'. Here, the heroine is afraid of the hero because of his powerful and sometimes unpredictable nature. But as the story progresses, their relationship undergoes a transformation.
One such novel could be 'Dark Desires' where the heroine is initially terrified of the brooding and mysterious hero due to his dangerous reputation.
Try 'Love in Shadows'. The heroine is scared of the hero because of his dark past and dominant personality. However, as they spend more time together, she begins to see a softer side to him.