维奥莱特（梅格翰·法伊 Meghann Fahy 饰）是一名多年来第一次约会的寡妇和单亲妈妈，她来到约会地点的一家高级餐厅之后，就因为她的约会对象亨利（布兰登·斯克莱纳 Brandon Sklenar 饰）比她预期中更有魅力和更帅气感到非常高兴。但是随着一连串的匿名讯息开始陆续传送到她的手机，维奥莱特就从一开始的烦躁逐渐陷入恐惧，而这两人之间原本擦出的火花也开始冷却下来。
后来她收到指示不准把这件事告诉任何人，而且必须遵守匿名讯息的指令，否则她透过手机上的家用监视器看到的帽T神秘人物就会杀死薇莉年幼的儿子以及正在当他保姆的维奥莱特的姐姐。维奥莱特必须完全按照指令行动，否则她所爱的每个人都会死去，而一直在无形中折磨她的神秘人物最后的指令又是什么？杀死亨利。

High Noon tells the story of a lawman named Will Kane (Skerritt) who has just married a young bride, Amy (Thompson), promising to leave his dangerous career and settle down for a quiet life. Just as they are about to leave, word comes that a vicious killer Kane had sent to prison years earlier, is coming to town on the noon train seeking vengeance. Kane attempts to rally the town to fight the gunman, but not even his former deputy Harvey (Diamond) is willing to help. Harvey's cowardice infuriates his girlfriend, Helen (Alonso), whose romantic past with both Kane and with the arriving gunman convinces her to pack up and leave town. As the dreaded noon hour approaches, Kane realizes he must stand alone against the coming storm.