內容簡介
頹廢的搖滾巨星、信仰虔誠的廣播節目主持人、感到羞恥的科學家，加上一個可能是世界最後希望的青少女，結合成一部帶著史蒂芬．金《末日逼近》與艾蜜莉．孟德爾《如果我們的世界消失了》小說傳統的史詩作品，將人性織進這個令人驚異的生存小說中。
Shana清晨醒來發現妹妹染上了怪病，她似乎在夢遊，無法說話也沒有醒來，並且帶著抵擋不住的決心前往只有她知道的目的地。不只是Shana的妹妹，美國各處都有如Shana妹妹一樣的夢遊者，他們加入了一場神秘之旅。除了Shana，還有如她一般的牧者伴著這群夢遊人，在這個漫長的暗黑之旅中，保護著他們的朋友與家人。
在旅途中，他們發現美國深陷恐懼與暴力之中，這個如末世般的夢遊病證明了恐懼它比病本身還危險。社會崩解了，超暴力民兵團威脅著要殲滅這群夢遊者，而他們的命運則寄託在揭露隱藏在這個疾病後面的謎。這個可怕的秘密，將撕毀整個國家，還是會團結這一群存活者，重整這碎裂的世界？
Shana wakes up one morning to discover her little sister in the grip of a strange malady. She appears to be sleepwalking. She cannot talk and cannot be woken up. And she is heading with inexorable determination to a destination that only she knows. But Shana and are sister are not alone. Soon they are joined by a flock of sleepwalkers from across America, on the same mysterious journey. And like Shana, there are other shepherds who follow the flock to protect their friends and family on the long dark road ahead.
For on their journey, they will discover an America convulsed with terror and violence, where this apocalyptic epidemic proves less dangerous than the fear of it. As the rest of society collapses all around them and an ultraviolent militia threatens to exterminate them the fate of the sleepwalkers depends on unravelling the mystery behind the epidemic. The terrifying secret will either tear the nation apart or bring the survivors together to remake a shattered world."