Like most pop-culture, I think romances can be separated into quality categories this way: 70% are crap, 20% are good, 9.x% are very good, and .x% are sublimely, unspeakably genius. The percentages are approximations, of course, and like I said, my theory is most pop-culture falls into these ranges: romances, mysteries, movies, magazine articles, various genres of music, video games, t.v. shows, etc. I've never put a series romance in the genius category (I have put some long-form romances there), but this one, I think, straddles the good/very good line, often falling all the way over into very good. I really enjoyed this story.
Abby Green writes great chemistry, and she wrote the characters in such a way that their behavior made sense (or as much sense as two people poleaxed by such immediate chemistry and strong emotion can make.) Both are increasingly uncomfortable and confused by their strengthening attachment, but this is one of those rare series romances where the heroine is actually more emotionally reticent than the hero. And their backstories are written in such a way that it makes sense. I didn't spend much time thinking, "you idiots!" (Just a couple of times. :-) )
HARLEQUIN PRESENTS are a fast read, but I swear I felt like I had taken a long journey with the two leads when I was finished. A long, emotional, satisfying-at-the-end journey.
THE FRENCH TYCOON'S PREGNANT MISTRESS is the first Abby Green book I've read, but it won't be the last.