The Secret of the Whispering Walls
Two of Nancy's elderly relatives are planning to sell their farm, but the paperwork is stolen and the sale is delayed. Nancy (with cowardly George in tow) goes to visit the elderly sisters, to figure out who would want to stop/delay the sale.
In subject matter and tone this closely resembles the book series that inspired it. There's a spooky old mansion, talk of ghosts wandering the hallways at night, a grumpy neighbour who wants to run them off, tunnels under the mansion, sounds in the night, and mysterious lights signalling from an upstairs window when everone is asleep. And it's a hoot from start to finish. Nancy is a dynamic heroine and Pamela Sue Martin has never looked more gorgeous (particularly when Nancy changes into a blue and white outfit midway through the episode).
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