Advice for my first novel?

I like the concept, I think you should stick with it! I think you should tell the story from both the girl and Winslow's point of view. At first the girl should be absolutely terrified of him, but over time she begins to warm up to him because he is kind to her. I think that at some point in the story, he should tell her she can go...and she does. And have her go back home and spend a little time there and have her family begin mistreating her again so she willingly goes back to Winslow's. Just a thought!