While there were parts I enjoyed, there were aspects to the book I disliked. Pretty much, the majority of the action, to use the term very loosely, takes place in only 3 places. Nearly all the story is dialogue with not much happening. Now, I enjoy witty dialogue, but The Courtesan's Wager left me feeling as if a huge chunk of the story was missing.
Part of the reason may be that I have not read any of the previous books in the series. However, I firmly believe that any book, even part of a series, should be able to stand on its own. Relationships were alluded to but not made clear, family members and acquaintances tossed into the story with little explanation, and events were mentioned as if the reader knew what had happened. I found it annoying, as well as confusing. And, there's quite a bit of tangled relationships going on.
Unfortunately, I found the heroine to be rather immature and the hero not very likable, and too much of it just plain silly and boring. But, if you've read the other books and liked them and Ms. Dain's style, you'll probably enjoy this one. If not, and you wish to give the series a try, I would suggest you find the first one and start there. I'll pass, though.