Barnaby must crack the clues to find the killer of a writer who sparked a nationwide treasure hunt.

Each year, the village of Angel's Rise hosts the Psychic Fayre. Founded by the Saint-Stephens family in memory of their late daughter, the event attracts mediums, psychics, and followers of the occult. When a body is found surrounded by ritual symbols on the eve of the festival, Barnaby must step into the spiritual world to find the killer.

The latest resident of a police retirement community is found dead.