Parishioner Charlotte McKinley asks Father Brown to exorcise her house, which she believes is haunted by her sister Elspeth, who disappeared nine years earlier. The priest suspects that somebody is playing an elaborate prank until Charlotte herself disappears from a locked room.
Inspector Valentine thinks Charlotte's husband Victor, a doctor fired from the job and previously believed to have killed Elspeth, is behind the disappearance. A coded message in a book leads Father Brown to discover the fates of both sisters, along with the legend of the family's hidden treasure.
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