Thirteen-year-old Cassie Palmer inadvertently invites a malevolent spirit into her life after attempting to test her inherited psychic abilities in a local cemetery. As the seventh child of a seventh child, Cassie possesses the gift of second sight, yet she remains skeptical of the supernatural until her experiment yields unexpected and dangerous results. She must navigate the consequences of her actions while contending with the presence of a mysterious, potentially threatening entity that has attached itself to her. The narrative follows her struggle to distinguish between harmless spirits and the dark forces she has accidentally unleashed, forcing her to confront the reality of the Other World.

This work is characterized by its focus on the intersection of childhood curiosity and the darker aspects of the supernatural. The premise suggests a narrative that balances the innocence of its protagonist with the encroaching dread of a malevolent haunting. Readers likely find the pacing deliberate, as the story prioritizes the psychological weight of Cassie's discovery over rapid-fire action sequences. The thematic exploration of responsibility and the consequences of meddling with the unknown provides a grounded foundation for the ghost story elements. The book stands as a representative example of mid-twentieth-century young adult supernatural fiction that emphasizes atmosphere and character growth.