A dazzling new novel by the author of Galatea 2.2 and Gain In a digital laboratory on the shores of Puget Sound, a band of virtual-reality researchers races to complete the Cavern, an empty white room that can become a jungle, a painting, or a vast Byzantine cathedral. In a war-torn Mediterranean city, an American is held hostage, chained to a radiator in another empty white room. What can possibly join these two remote places? Only the shared imagination,...