A Barnes & Noble Discover Great New Writers Selection * An Indie Next Pick * An Indies Introduce Selection * One of Reader's Digest 's Best Summer Books of 2019 * One of The Millions ' Most Anticipated Books of 2019 * One of Real Simple 's Best Books of 2019 "[This] might be the most optimistic post-apocalyptic story ever written. It's Sleepless in Seattle meets Station Eleven ." -- The A.V. Club Carson is on the East Coast when the electrical grid goes down. Desperate to find Beatrix, a woman on the West Coast who holds his heart, he sets off along a cross-country railroad line, where he encounters lost souls, clever opportunists, and those seeking salvation. Meanwhile, Beatrix and her neighbors begin to construct a cooperative community, working to turn the end of the world into the possibility of a bright beginning. Without modern means of communication, will Beatrix and Carson be able to find their way to each other? The answer may lie with one fifteen-year-old girl, whose actions could ultimately decide the fate of the lovers. The Lightest Object in the Universe is a moving story about adaptation and the power of community, imagining a world where our best traits, born of necessity, can begin to emerge.