I probably should give up on this author entirely. I liked one of her early books and have read a few more, all of which are huge disappointments. Ms. Crosby writes well. I like reading her stories. But characters lack depth and plots are thin. Characters in her books often are together just because they are hot for each other. And I am not even convinced of the passion.
This book has an interesting premise, the hero is the older twin but for some reason was cast aside as the younger son. His younger brother held the title and properties. The heroine is the sister of an enemy. They met, attraction flaired but of course thou shall not lust after your brother's bride.
It is all good. Except the lead characters are just fighting and insulting each other. He insults her because he is attracted but couldn't act on his attractions. Plus she is the enemy's sister. Gotta hate her, you know. She insults him back because he is rude and what a brute and oh so very scary. Plus she is a loyal little sister so she must hate him for family honor and her brother. (yawning) So we just read about how they "resist" each other by hating each other.
The villain didn't do much in this book. I found the 2 pages where the younger brother lost his virginty much more interesting than all the encounters between the lead characters. The attraction was not there. Even Bella and Edward in Twillight had more chemistry than these two.
I skim-read the book and finish it in less than 2 hours.