"My son has been erased." Those are the last words the woman tells Barry Sutton, before she leaps from the Manhattan rooftop. Barry learns that all across the country, people are waking up to lives different from the ones they fell asleep to. Miles away, neuroscientist Helena Smith is developing a technology that allows us to preserve our most intense memories and relive them. Barry's search for the truth leads him to discover that Helena's work has yielded a terrifying gift - the ability not just to preserve memories but to remake them - at the risk of destroying what it means to be human.