贝奇（蕾斯拉·德·奥利维拉 Laysla De Oliveira 饰）和哥哥卡尔（艾弗里·维提德 Avery Whitted 饰）驱车行驶在公路上，半途中，已经怀孕的贝奇感到非常的不舒服，于是下车休息，此时听到路边的高草丛里传来孩子的呼救声，循着声音，贝奇和卡尔先后走进了高草丛中，哪知道就此踏入了地狱的大门内。
高草丛仿佛一个有生命的恶魔，吞噬着一切误入其中的生命。在高草丛里，贝奇遇见了同样迷失在此的罗斯（帕特里克·威尔森 Patrick Wilson 饰），这个男人虽然仪表堂堂，却散发着危险的气息。贾维斯（哈里森·吉尔伯特森 Harrison Gilbertson 饰）是贝奇的男友，在女友失踪后，他踏上了寻人之路。
The film tells the story of single mother “Kara” (Elizabeth Roberts) who moves from New York to the quiet countryside with her two children for a job opportunity she can’t afford to turn down. The family moves into their humble new guesthouse. Kara begins her work as a private nurse to “Walter,” (Bruce Davison) a man stricken with multiple sclerosis and an appraiser of rare antiquities with a secretive past.
Her teenage son, Jesse, (Arman Darbo) is unhappy about this most of all. Losing his friends and moving to the middle of nowhere hasn’t made his job of looking after his little sister, “Cambria,” (Chloe Perrin) any easier.
Doom precedes them. “Akiba,” (Treva Etienne) a shady international associate of Walter’s, brings with him a mysterious relic of ancient origin. “Kara” encounters run in with a local sheriff played by genre veteran actor Denise Crosby.
All too quickly they discover the relic contains more than just legends. Inside, waits a terrifying creature born of ancient darkness and pure instinct…a pre-historic cave Spider unlike the modern world has ever seen.
