From the New York Timesâ€“bestselling author of War Dogs: A novel that â€śmay be the best constructed hard SF epic yetâ€ť (The Washington Post).
In a supernova flash, the asteroid arrived and entered Earthâ€™s orbit. Three hundred kilometers in length, it is not solid rock but a series of hollowed-out chambers housing ancient, abandoned cities of human origin, a civilization named Thistledown. The people who lived there survived a nuclear holocaust that nearly rendered humanity extinctâ€”more than a thousand years from now.
To prevent this future from coming to pass, theoretical mathematician Patricia Vasquez must explore Thistledown and decipher its secret history. But what she discovers is an even greater mystery, a tunnel that exists beyond the physical dimensions of the asteroid. Called the Way, it leads to the home of humanityâ€™s descendants, and to a conflict greater than the impending war between Earthâ€™s superpowers over the fate of the asteroid, in â€śthe grandest work yetâ€ť by Nebula Awardâ€“winning author Greg Bear (Locus).