Con Artist FMC?

I'm looking for a book where the FMC is conning the MMC. Ideally she's competent and manages to successfully or almost successfully con him. I'd also like if the MMC doesn't find out about her for a good while, so when the reveal happens there's all the more angst. Spies, etc would also be welcome.

Something like {The Duke and the Lady in Red by Lorraine Heath} is exactly what I'm looking for, another one with a similar-ish premise that I enjoyed was {Duke of Sin by Elizabeth Hoyt}

I'm really in the mood for smart and conniving FMCs!

Thanks!!