In the year 2961, the time is after humanity and nature has recovered the land. A hunter named Cygnus is called to rise above his duty. He provides for Last Arc, a once nomadic band of survivors in need of food and water that is now growing scarce. The answer must be found before a group of outlandish Heretics descend upon them. Cygnus must voyage across the treacherous landscape to defend his people. Sent by Nova, the matriarch of the band, she acts based on her vision for Cygnus to find a seed of hope. The future of Last Arc is for him to discover, Cygnus ventures into a hostile landscape in search of an answer for his people. On this journey of encountering many traps and dangers, Cygnus discovers what has been hunting him is his identity.
查穆先生（罗伯特·雷德福 Robert Redford 饰）是一名老木匠，他总喜欢给孩子们讲一个关于龙的故事，故事中的龙居住在位于太平洋西北部的茂密丛林中，查穆先生说他曾经亲眼见证过龙的存在。女儿格蕾丝（布莱丝·达拉斯·霍华德 Bryce Dallas Howard 饰）对于这个父亲已经讲了一百万次的故事不屑一顾，她认为这绝对是父亲信口胡说乱编的故事。 一次偶然中，格蕾丝遇见了一个名为彼得（奥克斯·弗格雷 Oakes Fegley 饰）的男孩，男孩告诉格蕾丝，他没有亲人也没有家，唯一的朋友便是一条名叫艾略特的飞龙。皮特的叙述让格蕾丝想到了父亲的故事，两者之间有着惊人的相似，为了证实彼得的话，格蕾丝踏上了寻找龙的旅途。
A girl flees her orphanage in a paranoid belief that otherworldly forces are after her. She seeks refuge in the remote town of Fate, Texas, but is met with hostility. The residents are about to enter her Hell.