Sender Unknown is probably closer to science fiction than any other category but deals with several modern cutting-edge fears: mail bringing "surprises," the possibility that people could be created in new "scientific" ways, the growing need for everyone to remain flexible in response to the world, rather than become rigid and all alike.
The story is chock full of the unexpected and most of it is very pleasant. I found myself totally absorbed and was glad that I was sick so that I could continue reading as long as I wanted without feeling guilty. The ugliness of life in this book is so well-disguised that anyone of any age is safe reading this book and yet they will be challenged.
Andrew, the boy through whom the story is told, is of an age to be augmented, that is gentically altered so that he can succeed in a certain field. Andrew decides to remain unaugmented. To compensate for his decision, Andrew's father accepts a post on distant Miner's World. Once on Miner's World they are taken to their house, an odd building, by Tomas, the strange, once successful, now considered odd at the least, miner. They encounter aliens, water people, and the dangerously secretive miners.
Sallie Lowenstien breaks up her fast paced book with stories Andrew tells his little sisters. The stories helped me pace the book and say 'okay, here's a good stopping point.' The stories are illustrated with pencil drawings, which show that Sallie is as good an artist as an author.
After waiting months for this book to be available to me I was not in the least bit disappointed. Focus was well written, full of great detail, very convincing, and an original book.