講述美國西部在南北戰爭15年間的多方面擴張及聚居，這段史詩般的旅程充滿了危險和陰謀。

　　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.

　　某座平凡小鎮，彪悍恐武的警探約翰·伊利亞特（維尼·瓊斯 Vinnie Jones 飾）和美麗善良的女兒海瑟（Emily Tennant 飾）生活在一起。某天一名酷酷的男孩來到海瑟的學校，他叫羅比·穆勒（杰克·克羅克 Jake Croker 飾），五年前曾和海瑟有過一面之緣，并且卷入了一場神秘恐怖的死亡時間。羅比似乎對海瑟頗有好感，但卻因此惹惱追求這個女孩的格雷戈（Aren Buchholz 飾）。在一次爭執中，五年前的恐怖一幕再度上演，格雷戈在沒有任何人碰觸他的情況下突然倒地，遭受重創。　　不久后格雷戈傷愈出院，卻死性不改，對羅比欲行不軌，最終在野外死于一場離奇的事故。約翰受命調查此案，種種疑點全部指向了神秘而陰森的羅比……

　　疏離多年的手足被迫重逢，直面未解的心結，重新審視與情感疏離的父母之間緊張的關系。