This fictional narrative likely refers to a story featuring the Fourth incarnation of the Doctor, the central character in the long-running British science fiction television series Doctor Who. This specific adventure seems to involve a spectral entity or mystery located in a place named Gralstead. Given the established conventions of the series, the narrative would probably involve time travel, alien encounters, or other paranormal phenomena, all investigated and resolved by the Doctors intellect and ingenuity.
Such imagined narratives contribute to the rich tapestry of the Doctor Who universe, expanding upon the established canon and providing fans with new scenarios to explore. Fan-created stories, whether in written, audio, or other forms, demonstrate the enduring popularity and cultural impact of the series, allowing for creative expression and engagement with the established characters and themes. They often explore deeper aspects of the characters and lore, offering alternative perspectives and interpretations.