A good SF thriller by alleged real-life alien encounterer. A plausible extraction to the present day given the assumption that Roswell really happened: a secret government organization with nearly unlimited reverse engineered technology trying feverishly to cover up the existence of extraterrestrials. A very interesting sub-plot -- there was a previous human civilization before the ice age that now lives on another world.
http://www.amazon.com/Grays-Whitley-Strieber/dp/0765313898/sr=8-1/qid=1159885128/ref=pd_bbs_1/102-4124072-5596945?ie=UTF8&s=books
