Randall and Hopkirk (Deceased) (1969)

Somebody Just Walked Over My Grave (1x17)

Uitzenddatum: Jan 09, 1970

Marty's headstone is knocked over, and Jeff is knocked out by a man dressed in 18th century attire when he goes to investigate. What does it have to do with a wealthy man and his agoraphobic son who live in a mansion next to the cemetery?