I was pleasantly surprised by this free ebook download. Some of the free books I've read, haven't been all that well written... However, despite some typos, I found this book a very entertaining read. My late dad was a huge SF fan and I grew up reading SF classics, but haven't really found much modern SF that I liked (with the exception of Connie Willis' time travel books). This story was well written, interesting and at times really creepy. The characters are not quite as good at the plot. Like in many other SF stories, the writer seems to be expecting a male reader and the female characters are as you might expect... Other than that, I have no complaints.