Joshua has just been told the truth about the world. Namely that no one is left, except for a handful of young people and the last of the Elders, a sect of radical environmentalists who are determined to give the planet a chance to heal from human impact. They've chosen Joshua to lead a final expedition in search of remaining pockets of human life, and have trained him to sterilize anyone he comes across. But to ensure the mission's success, the crew supporting the expedition has been told a very different story. And as this group of young men uncover the truth, along with the incentive behind the lies, together they spiral into an unstoppable adventure of ethical struggle and survival.