If I was to rate the book as being one of Lisa Gardner's new type of writing, I would give it a solid 4.
Since I'm rating it as any romantic suspense, I'm giving it a 5 !
As always, the author did it for me : the plot, the characters building, their background, the sociological aspect, the romantic story as well as the suspense, I loved it all !
And I've already ordered the next book, so I'm keeping an eye on my mail box ^^