London teenager Will Hodge is miserable. His mother is dead, his father's political leanings have grown radical, and his friends barely talk to him. To top it off, he's having nightmares about things like concentration camps. Then Will notices he's being followed by a group of people who claim to know him from another time in history. It turns out they are Returners, reincarnated people who carry with them the memory of atrocities they have witnessed in the past. Will realizes that he, too, is a Returner. But something about his memories is different, and with dawning horror, Will suspects that he wasn't just a witness to the events, he was instrumental in making them happen. Set in the near future, with the world on the verge of a new wave of ethnic cleansing, Will must choose to confront the cruelty he's known in his past lives, or be doomed to repeat it...