Can't remember the title!

[imagineer13]

I read it about 2-4 years ago I believe. The book was set in the pride and prejudice era, also in England I think. I remember one part only--these two young ladies were kidnapped and taken to a castle and kept there. The kidnapper was oddly kind to them. There were later rescued by the two main male characters. Come to find out, one of the rescuers was actually the kidnapper who now knew that because the girl's family was indebted to him for the rescue, she would be allowed to marry him.

I know it's not much information, and I'm really sorry about that, but this literally kept me up for hours last night. Any help would be very welcome!