The underlying idea, that of a extraterrestrial parasite, is a good one, but there are so many plot holes as to make it completely ridiculous. I've read Dietz's "Legion of the Damned" series, so I'm used to his style, but it works better when you know you're reading a kind of popcorn series than a standalone novel. My theory is that Dietz has a checklist of "Novel Essentials" that he's been using for years. Makes up a plot, creates bullet point notes for each chapter, and slowly checks off each item on the list. Sexy male protagonist, check. Sexy female protagonist who will absolutely have sex with the male protagonist, check. Slimy male secondary character who manages to redeem himself by the end, check. And so on. The writing is simplistic, but he does manage to keep the plot pace moving.
This was an okay quick read while I waited for other books to come in, maybe something fun for the beach or to read on the bus. The ending, however, made me want to throw my iPad! I checked to see if there was going to be a sequel to rectify things, but it appears there is nothing.
*SPOILER*
You're going to drag me through the entire book wondering what happens if the parasites actually mate, and then not reveal the outcome?! Dude. Not cool.