A police lieutenant uncovers more than he bargained for as his investigation of a series of murders, which have all the hallmarks of the deceased Gemini serial killer, leads him to question the patients of a psychiatric ward.
After a deadly plague kills most of the world's population, the remaining survivors split into two groups - one led by a benevolent elder and the other by a malevolent being - to face each other in a final battle between good and evil.