Eighteen-year-old Eva has spent the last year punishing herself for her sister's death and hiding from everyone she comes into contact with, human or otherwise. With the population destroyed and the Earth left in ruins, she sees little hope left for the future.But when she crosses paths with Walker and Tara something inside her awakens. Something she thought had died along with her entire family. In these new friends Eva sees a promise of what the future could be, as well as evidence that humanity might not be extinct after all.When a ghost from Eva's past makes an unexpected appearance, the group sets out on a cross-country trek that will teach Eva how to love and hope again, and will remind her what it truly means to be human.