在明尼蘇達州北部的“邊界水域”中，六個老朋友之間的周末露營之旅在神秘的環境下死亡后變得悲慘起來，隨著他們企圖在本集團內揭露殺手，引發進一步的動蕩。

　　The boisterous, arrogant professor Challenger, a reputed biologist and anthropologist, dares the London Zoological Society to mount an expedition to verify his spectacular claim, without physical proof, that his previous expedition to the Amazonian basin found live dinosaurs. Apart from him and his 'socialite' counterpart, professor Summerlee, it consists of experienced discoverer Lord Roxbury, the young reporter Ed Malone -who got publicly struck down with Challenger's umbrella at his arrival- and Jennifer Holmes, Malone's news agency's boss's daughter, essentially as conditions for putting up the money. In Brazil they are joined by Jennifer's brother David and local 'guide' Manuel Gomez. They soon discover the dinosaurs are real and dangerous, like giant spiders, but loose their helicopter and thus are desperate for a way down from the isolated plateau. They learn Roxbury knew about the fate of Burton White, an explorer whose diary they find, thus presume to be dead, in search of diamonds, and confirmation of the local tribe being the lethal guardians of the plateau's secrets, but also get surprising help...

該片以詩圣杜甫創作鳳凰臺為引，講述了三位甘肅成縣人士回鄉參加鄉賢大會時，揭開了一段深埋于記憶長河的往事。

　　科學家們在一個小鎮的供水系統中下毒，把居民變成殺人狂魔，他們互相殘殺，任何人都能通過。