I'm way invested in this story by now. I love the actual concept of this series, and the way she's been able to just add more people into the "family" and keep expanding the overall storyline of Dr Whitney being the ultimate bad guy. This doesn't give anything away, but if you're reading this review and you haven't read the other books before this, then go back and start at the beginning.
First, if you don't like romance novels that have matehood in it, then I would skip this series, and actually I would actually skip all of Christine Feehan's novels. That seems to be an element in almost all of her books. It is a nice break from some of those angsty romances and sometimes I just need to know that the two characters realize their feelings and don't spend a lot of time going back and forth with each other. I do love this series just because of the concept of the super soldiers and the spin that Feehan put on it. I recommend this for adults only as it is really spicy, as are all of Feehan's books. And please, start with book 1. :)