Zodiac Killer

Michael works at a nursing home and is growing tired of people who neglect to care for their elderly relatives. He reads a book by Simon Vale about the Zodiac Killer which inspires him to go on a killing spree. Michael claims Zodiac's title, targeting those who mistreat the elderly. The only person who suspects Michael is Simon Vale, who plans to use Michael's scheme as the subject for the latest revision of his book on the Zodiac killings.