First Light begins with an ominous coincidence: the reappearance of the ancient night sky during the excavation of an astronomically aligned Neolithic grave in Dorset. A group of eccentrics -- archaeologists, astronomers, local rustics, a civil servant, and a stand-up comic -- converge on the site, disturbing the quiet seclusion of Pilgrin Valley. Someone (or something) is trying to sabotage the best efforts of the excavators, headed by Mark Clare,...