1 Book Found

Based on your description:

"A romance story where the girl lives in a run down castle and finds out that the castle has a new owner from gambling. She has to host the new owner and his group of friends. she dresses up in an old clothes to scare the group of friends at night. she gets locked in a closet by the hero until the coast is clear. the new owner is called back to London and she follows and stays with a relative and finds out the owner is a duke. "