These three very loosely connected novels span thousand of years. Nagata writes competently about a future in which humanity is first technologically lifting itself off earth, and finally scattered about a hostile universe. I enjoyed them even though Nagata does two things which annoy me. The first is that the novels are in parts rather boring. Nothing much happens. The other thing is that she can be very depressing. Vast especially makes me feel just a bit too small in a vast (heh) universe.