Laura and Rosemary take up residence at a cathedral in order to restore its herb garden for a millennium celebration. They are soon swept up in the intrigue surrounding the inhabitants, including a newly in-charge deacon who is looking into past financial improprieties, his young wife and her younger daughter, the daughter's boyfriend, who has a criminal record, the pair who run the Cathedral gift shop and may be skimming the profits, and the newly crippled dean. When the Catherdral's patron saint's stone statue becomes an instrument of murder, Rosemary and Laura discover that the old adage about bad things happening in threes seems to be coming true.