In this new world, Carson, on the East Coast, is desperate to find Beatrix, a woman on the West Coast who holds his heart. Working his way along a cross-country railroad line, he encounters lost souls, clever opportunists, and those who believe they'll be saved by an evangelical preacher in the middle of the country. Meanwhile, Beatrix and her neighbours begin to construct a cooperative community that suggests the end could be, in fact, a bright beginning. Without modern means of communication, will Beatrix and Carson reach each other, and what will be left of the old world if they do? The answers may lie with a fifteen-year-old girl who could ultimately decide the fate of the cross-country lovers. The Lightest Object in the Universe is a story about resilience and adaptation, a testament to the power of community, where our best traits, born of necessity, begin to emerge.