Mrs. Peel is bequeathed an old house by an uncle Jack, whom she never knew existed. In the event, he did not exist. The house is a former lunatic asylum and it is all a ruse by a vengeful ex-employee of Mrs. Peel's to submit her to mind games which will drive her insane.
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Did You Know?
The "suicide box" was used earlier as the elevator in Armstrong's factory in "The Cybernauts". See more
(at around 55 mins) A crewman looking down can be seen in the reflection of the machine. See more
What happened to the shining armor?
It's still at the laundry.