A teenage sorceress named Nimue encounters a young Arthur on her quest to find a powerful and ancient sword.

A trio of witches is trained to become powerful weapons for the American military.

In Pasadena, Mrs. Davis sends her daughter Aubrey Davis to Tokyo to bring her sister Karen Davis, who is interned in a hospital after surviving a fire, back to the USA. After their meeting, Karen dies and Aubrey decides to investigate what happened to her and gets herself trapped in the same situation, being chased by the ghost of the house. Meanwhile in Tokyo, the three high school mates Allison, Vanessa and Miyuki visit the famous haunted house and are also chased by the ghost. In Chicago, Trish moves to the apartment of her boyfriend Bill, who lives with his children, the teenager Lacey and boy Jake. On the next door, weird things happen with their neighbor.

The sculptor Jess unsuccessfully tries to retrieve the custody of her teenage daughter Chloe. During the night, Chloe and her boyfriend Danny play a prank challenging an urban legend: and they knock twice on the door of the witch Mary Aminov. Soon Danny is hunted down by a fiend and vanishes. When Chloe is haunted by the evil spirit, she flees to the house of her estranged mother and her husband Ben to stay with her mother. Soon the demon finds her and haunts the house while Ben is traveling. Jess' model Tira sees darkness around Chloe and she researches the Internet about the mystery. Meanwhile Detective Boardman is investigating the disappearance of Danny and suspects Jess is manipulating her troubled daughter.

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