Some may have found last previous books, like 10 and 11 frustrating. I know I have! Although Stephanie gets a new case and solves it with the usual hilarious high jinks (and often losing multiple cars), her personal life and that of the people around her stay still. So, when I read this, in one sitting, finishing some time around the dawn chorus I was more than happy.
Evanovich does not tie up any loose ends, so she maintains interest for the rest of the series, long may it reign! Lula, for instance, finds an additional occupation and manages to drags members of Stephanie and Rangers crews along for the ride. Therefore, developing her own stand alone character, independent of working with Stephanie.
As said in other reviews, we are introduced to some new characters. The 'love triangle' is taken up a notch. And Tank speaks more than 5 words! All of this to the backdrop to a child kidnapping close to Rangers' heart.
Any one who love the Stephanie Plum series will love this. Any one looking for suspense and more than a few laughs along the way should definitely get in these books.