Slow starter. The first four chapters were rather bland, and I thought to myself that it might take me a while to read this short book and that I might rate it a solid two stars, but by the fourth chapter there was a small spark of interest. I boldly read on with some hope. I have read a few of A. Bertram Chandler's books and as a fellow sailor found a lot of his fiction interesting, so I kept turning pages. By chapter 8 the plot had thickened like a vat of cold gelatinized gravy. The hook was deeply set and it was all I could do to set the book down to eat and use the restroom. This sci-fi is written in a unique fashion as it is written somewhat like a hardboiled detective novel with a sci-fi setting. This was a first for me, and I have to admit that I liked it. I give this book a solid four stars and caution a reader to expect a bland start, but with a little patience, one can expect a nice turnaround as events begin to unfold, and plots get twisted like the mind of Edgar Allen Poe.