Earthfall/Earthborn

Bummer. Found this at the library. it sounded familiar, and i now realize i've read these before. this is a single volume that has both Earthfall and Earthborn in it. the bummer is these are actually volumes 4 and 5 of a series, and i don't remember most of what happened in vols. 1, 2 or 3. I'll need to re-read those soon too.