Wen Spencer's eighth novel, Endless Blue, can be read as simply a fast-paced, engaging scince fiction novel...but that misses half the fun. Under the action, well-realized characters, and thoroughly unique setting are the kind of questions that science fiction was originally invented to ask. What is the nature of humanity? How do we define, and choose, good or evil? Is there a meaning to the cosmos, and do we have a place within it? What is God?
Set in a far-distant future, this is Spencer's first "Pure" science fiction novel. The action is fast enough that it is almost impossible not to read it quickly, but the writing is worth a closer look. Earlier novels have boasted some excellent lines, but the writing here is consistently tight without sacrificing poetry.
One caveat: while her "Alien Taste" series is PG to PG-13, and the Tinker Duology is rated R, this book is R shading into NC-17. While occassionally graphic, it is never gratuitous, but I would not be comfortable recommending it to readers much under 18.