book where the hero doesn't recognize the wife. They attend a party that lasts 3-7 days but all guests had to keep their masks on.

[Neha]

Hi,
I Read this book a few months back and I cannot remember the name of this book. It was a historical romance book where the hero doesn't recognize the heroine because she wears a mask. The plot was something along the lines of a lady (side character) throwing a week long (3-7 days) party because she believes her husband doesn't love her anymore and that he ignores her. Turns out that wasn't the case at all. The heroines either married to the hero or had a history with him. All the guests at this party were given their separate rooms and were told to wear masks. Towards the end of the book, the hero falls in love with the heroine but she keeps pushing him away. I don't remember if she was actually his wife but I do remember that when the hero told the lady of the house his feelings for the heroine, she gave him. weird look, but didn't say anything. Does anyone know the name of this book?
It is not unforgivable by Joanna chambers.