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As a psychic is telling the futures of two young women, she begins to see her own murder taking place. When the psychic is found dead, it's up to the CSIs to determine the cause of death. Greg, who has a family "occult" history, thinks that the woman's death may be a result of greater forces, but Grissom, characteristically, is reluctant to believe in the supernatural.
The term spellbound generally relates to the magical concept of a love potion, or love spell, by which one person may bind another (presumably of the opposite sex) to them without regard to their natural inclinations.