Years after a mysterious plague wipes out humanity, Halley Clarke leaves the safety of home to search for other survivors. She finds Nate Reynolds, a young man devastated by loneliness and despair. Instantly, there is an inexplicable connection between them, and it becomes clear that this was no ordinary virus. They soon discover they aren't the only ones changed by the virus or guided by strange feelings or voices. Their lives and the survival of humanity rests on uncovering answers and understanding their new world. Will the truth they unearth bring them closer together or tear them apart?