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Joy is a student from Hong Kong living with eight other roommates in San Francisco, all of them in college together. Her health starts deteriorating because she hears noises in her head, noises that eventually cause her to try to kill herself. After that attempt, her roommate Ivy telephones Joy's brother in Hong Kong and asks him to come quickly to see after his sister. He arrives and a mutual attraction sparks between himself and Ivy. Joy finally does kill herself, and as the brother leaves for Hong Kong, he vows to come back and marry Ivy. What Ivy does not know is that he is just as sick as Joy was, only the disease manifests in him as the urge to kill. When he returns to San Francisco, he murders all of the remaining roommates in bloody awful ways until Ivy takes matters into her own hands.