This book has its positives and its negatives. With the plot, one would expect a sort of "B-movie". However Koontz did a great job at making the book work despite its premise being so far out there.

The characters were the best I have seen from Koontz so far. Though many of his characters have been intriguing, these were multi-layered and at times were interesting mirror images of one another. It gave it an interesting way of combining "Frankenstein" with "Dr. Jekyll and Mr. Hyde".

The first problem I had (which is my personal opinion) was in the dog. (possible spoiler alert) It was constantly trying to communicate with the main character, and at one point drew a question mark. Yet, for some reason, though it knew how that worked, it knew nothing else about grammar and could not even think of the concept of nodding, or shaking its head. Even when the characters later start to communicate with it they try to use something dogs always do. It simply made it personally frustrating at times when I wanted to yell at them to tell it to nod for "yes" and shake its head for "no".

The other draw back was in the second half of the book. Until the last 30-40 pages, the second half slows down and most of the suspense leaves the story as we are told that the danger is far away. At the same time as this starts happening it becomes a little too melodramatic.

Then, the last positive side also becomes a negative. Of all novels I have read this could have the best humor of all...but also the worst. For the first half of the book it's funny to see the dog almost smarter than our main character. Yet, as we get to the second half of the book, the humor starts to take front stage, and all of the tension is hidden even further because of it.

Is it a fun read?... Definitely! Is it a great piece of literature?... Definitely not! Is it one of his best?... That's up to you.