HaBO: Yet Another Scarred Hero, Virgin Heroine

This HaBO is from Krysty, who wants to find this romance:

Hi, I stumbled upon your website yesterday hoping someone will help me find this book. It’s been in my head for over 10 years and I’m beginning to forget.

So the book is about a heroine – Marianne or Mary – can’t quite remember, falls in love with a brooding, standoffish hero with a scarred face who stays in the dark in a big mansion. He likes to hide in the dark because he’s conscious of his scar gotten through fire (not sure). I think he came to visit the heroine’s father when she caught a glimpse of him and had a crush on him. He likes to wear a hat too to cover the side of the scar.

She found a way to his house and tried to find out more about him. Fast forward, they had sex (she was a virgin) but he didn’t believe there could ever be a happy ending between them because of his scars. There was a happy ending, of course.

The book cover had moonlight over a lake. You might mistake it for a suspense/thriller novel. I know it’s not a lot of information but my memory is not so great anymore with the details. Please, I don’t know why but I NEED to re-read that book. Maybe because I was so innocent when I first read it or that I’m also deformed but it left a mark on me as a teenager. Thank you in advance.

I know this is some hefty catnip and we have a lot of ground to cover!