自行车送货员安妮(Rebecca Palmer)在一趟例行公事的运送过程中撞到陌生人克里斯(Ben Price),跟他回去公寓发生了一夜情,自此开始她意想不到的恐怖经历。安妮隔天醒来,带着愧疚的心,她决定带男友麦克(Tom Frederic)到山林里进行一趟浪漫之旅,他们沿着山缘骑车而下,新鲜的空气和奇异的美景让他们心旷神怡,直到克里斯突然出现,杀了麦克,展开了致命的生死追逐……Anne is an avid bicycle enthusiast. She has a one night stand with a fellow biker, Chris, who is also apparently a cop. He gets rough with her and the memory haunts her. Three days later her boyfriend, Micheal, and her go into the Whistler range of mountains for a biking trip. Chris shows up, stalking and frightening them as they make their way further into the dangerous mountain range. Micheal is killed and Anne spends her time trying to survive, while witnessing the demise of several other innocent "bystanders" in the process.