The Ghost and Mrs. Muir

The Ghost Hunter (1x4)

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Claymore brings a stranger to look at the house who claims he is a student of architecture and wants to take photos of the house. When he comes back to the house after the Muirs leave for the evening Captain Gregg thinks he's a burglar and tries to scare him away, not realizing that he is actually a parapsychologist who is determined to find the ghost of Gull Cottage and make him known to an unsuspecting public.