Writer Jennifer Hills (Butler) takes a retreat from the city to a charming cabin in the woods to start on her next book. But Jennifer's presence in the small town attracts the attention of a few morally depraved locals who set out one night to teach this city girl a lesson. They break into her cabin to scare her. However, what starts out as terrifying acts of humiliation and intimidation, quickly and uncontrollably escalates into a night of physical abuse and torturous assault. But before they can kill her, Jennifer sacrifices her broken and beaten body to a raging river that washes her away. As time passes, the men slowly stop searching for her body and try to go back to life as usual. But that isn't about to happen. Against all odds, Jennifer Hills survived her ordeal. Now, with hell bent vengeance, Jennifer's sole purpose is to turn the tables on these animals and to inflict upon them every horrifying and torturous moment they carried out on her... only much, much worse.

In the 1870s, Captain Nathan Algren, a cynical veteran of the American Civil war who will work for anyone, is hired by Americans who want lucrative contracts with the Emperor of Japan to train the peasant conscripts for the first standing imperial army in modern warfare using firearms. The imperial Omura cabinet's first priority is to repress a rebellion of traditionalist Samurai -hereditary warriors- who remain devoted to the sacred dynasty but reject the Westernizing policy and even refuse firearms. Yet when his ill-prepared superior force sets out too soon, their panic allows the sword-wielding samurai to crush them. Badly wounded Algren's courageous stand makes the samurai leader Katsumoto spare his life; once nursed to health he learns to know and respect the old Japanese way, and participates as advisor in Katsumoto's failed attempt to save the Bushido tradition, but Omura gets repressive laws enacted- he must now choose to honor his loyalty to one of the embittered sides when the conflict returns to the battlefield...