Until November 1967, Dark Shadows was set in contemporary times. So when #283 was shown in July 1967, we could assume that its dramatic date more or less matched its broadcast date.
In that one, psychiatrist Julia Hoffman (Grayson Hall) brought her patient Maggie Evans (Kathryn Leigh Scott) to the old cemetery north of the village of Collinsport, Maine. When Maggie reacted to one or another of the sights of the cemetery with a particularly strong emotion, Julia pressed closer to it. This technique led the two women to a mausoleum. Once inside the mausoleum, Maggie had the strongest reaction of all. Julia was trying to break through Maggie’s amnesia. She did not yet know that vampire Barnabas Collins had held Maggie prisoner, and that there was a secret room hidden in the mausoleum where he once tortured her.
Now, the dramatic date is 1897. Broad ethnic stereotype Magda Rákóczi (Grayson Hall) brings neurotic intellectual Rachel Drummond (Kathryn Leigh Scott) to the old cemetery north of the village of Collinsport, Maine. Rachel’s position as governess in the great house on the estate of Collinwood has been eliminated, and she is terrified that she will have to return to Worthington Hall, a hideously abusive school where she was forced to spend a miserable childhood as a pupil and an equally miserable first part of adulthood as a teacher. The headmaster of Worthington Hall, the evil Gregory Trask, is demanding Rachel return to his school-cum-cult, extorting her with threats of false criminal charges against her and her one friend from the school, fellow student-turned-teacher Tim Shaw. Magda takes Rachel to the same mausoleum we saw in #283, because she knows about the secret room and has decided it is the perfect place for Rachel to hide from Trask.
Meanwhile, Tim is on the job at the school, shaking his head at Rachel’s former charge, twelve year old Jamison Collins. Tim is played by Don Briscoe, who when the show was set in 1968 and 1969 played cursed brothers Tom and Chris Jennings. The Jenningses were supposed to be bad-boy sex symbols, and Briscoe often seemed stiff and uncomfortable when he had to take his shirt off or be aggressive. But as a beaten man who takes refuge from his guilt in pomposity, he’s just terrific. They found the perfect part for him.

Jamison hasn’t done his schoolwork, and Tim is keeping him after class. Trask enters, and asks why Jamison is in detention. Tim claims that Jamison is not being punished, but that the two of them are just talking. Trask is displeased with that hint of friendliness, and before long he finds a reason to lock Jamison in a storage closet. Jamison objects to this confinement, prompting Trask to gleefully declare that “there are worse punishments! Much worse!” When Jamison lets himself out of the closet, he finds Trask waiting for him, grinning. Trask says that they will spend the day together tomorrow, and that in the course of their time together he will ordain Jamison’s further punishment.
Trask sends Tim to Collinwood to fetch Rachel. He makes a show of resistance before going. At first he has trouble finding her; he goes back to the school and reports to Trask that he has failed. Trask refuses to accept this, and sends him back. Tim meets Magda and persuades her that he is Rachel’s friend. She leads him to the secret room, and leaves him alone with Rachel. When Rachel and Tim leave the room, Trask is waiting for them.