This book is labeled as a science fiction thriller and it certainly has more than enough of both elements to satisfy the needs of readers looking for either. The book is also somewhat of a throwback to the science fiction of the fifties and sixties with a focus on how technology allows travel and alien interaction without spending a lot of time on the technology itself or the methods. Thus, we have the train system that gets you from planetary system to planetary system. Of course it's not a real train but if it functions like one, has cars like one, conductors like one and rolls into and out of stations then it's close enough to a train for arguments sake.

(Source: Tor Books)