First two books in series were excellent!! I waited and waited for Shattered Hourglass. I read it (it was painful) and did not know exactly what happened. I went back through it, still scratching my head.
First, I wish I had known that John and Kilroy would have been secondary to other storylines. The heroes were relagated to the back burner in a story that was weak. Second, I wish I understood what "quantum" and "C-130" had to do with anything. I don't know if spending more time writing, less time re-writing, or just getting your act together before publication is the answer.
IF you have the time and money, go read the first two. Then, imagine your own ending, I think you'll be happier not touching this book.