娜奧米-沃茨在影片中扮演一個名叫瑪麗的兒童心理學家，她遭遇了人生中最不幸的事件：丈夫被一場離奇車禍奪去了性命，兒子則因這次災難變成了植物人。一次偶然的機會，瑪麗邂逅了一個叫湯姆的患兒，她將這個詭異的男孩帶回家撫養，卻因此招來了一連串不可思議的事件。

　　The persona of a celebrated author is threatened when her best friend and muse reveals the dark secret behind her first novel's provenance, igniting an incendiary tale of sex, lies and betrayal.

 2008年金融危機下，美國內華達州昂皮爾小鎮的重要經濟支柱石膏廠倒閉，人去鎮空，這里的郵政編碼也被取消。丈夫去世后，幾乎在在昂皮爾小鎮度過了一生的弗恩（弗蘭西斯·麥克多蒙德飾）無力獨撐生活。為了將生活成本壓到最低，她將簡陋的家當搬上了改裝后的廂式貨車，開始了一邊打工、一邊西行的公路生活。她在亞馬遜流水線上、在游樂園的咖啡廳里、在國家森林公園做臨時工。一路上，她和許多廂式貨車寄居者相遇、相識，彼此幫助，并締結了友誼。

　　In a small rural community local police officers Zoe and Patrick begin their shift as normal but it soon becomes clear that something is wrong. Strange events unfold before their eyes, residents begin behaving strangely and mass suicide panic spreads amongst the community they are trying to protect. Zoe and Patrick realise they are under siege from alien machines as they become cut off from the outside world. They are forced to do battle against these uninvited visitors. With the help of some of the residents Zoe and Patrick begin unravelling the mystery and soon discover it is not all as it seems. Can Zoe and Patrick save their community and the outside world from extinction?　　在一個小的農村社區，當地警察佐伊和帕特里克開始正常換班，但很快就清楚出了問題。奇怪的事情展現在他們眼前，居民開始奇怪的行為，大規模的自殺恐慌在他們試圖保護的社區中蔓延。佐伊和帕特里克意識到，當他們與外界隔絕時，他們正受到外來機器的圍攻。他們被迫與這些不速之客作戰。在一些居民的幫助下，佐伊和帕特里克開始解開這個謎團，很快發現它并不像看上去的那樣。佐伊和帕特里克能拯救他們的社區和外部世界免于滅絕嗎？