Episode 18 is an exercise in minimalism. The first year of Dark Shadows is known for episodes with a full cast, lots of extras, and exterior filming. But this episode has none of those things: apart from the usual glimpse from the back lawn of the “Collinwood” mansion at the beginning, no location footage, no extras, and only three actors. In fact, this is only one of a handful of episodes in the entire series to feature just three actors. And it’s all within the confines of Collinwood itself: Vicki’s room, the upstairs hallway, David’s room, and the downstairs foyer and drawing room are all we see in these twenty-two plus minutes.
It’s still the night of Roger’s car accident, but he can’t sleep at this late hour. After discovering that someone most definitely tampered with the brakes on his car, he figures it must have been Burke Devlin, who David’s governess Victoria Winters found standing in the garage by Roger’s car with a wrench in his hand, after having invited him into town for a meeting to discuss a business deal.
This is only Vicki’s second night at Collinwood, and for the second time in as many nights she is dragged out of bed to face yet another drawing room interrogation from Roger about Burke Devlin. Before heading out to Burke’s hotel room at the Collinsport Inn, Roger needs to get a witness who saw him there in the garage near the car and find out what Miss Winters knows and what it was exactly that she saw, so that he can then confront Devlin in person and throw the whole thing right in his face.
So that’s why other cast members wouldn’t be needed. This late at night, Elizabeth and Carolyn would be sleeping. It’s only the people directly involved with Roger’s accident, those who either experienced or witnessed something, who would be awake at this time of night.
Which leaves David. He can’t sleep either. In fact, in the previous episode he woke up several times in the night with bad dreams, screaming to his aunt Elizabeth that he didn’t mean to kill “him.” In this episode, he’s in his room, in pajamas and bathrobe, crushing one of his model cars with his foot and then tossing it out the window. Soon after, he confesses to his governess, “I wrecked a car.” That should be a tip-off, to Vicki at least, that there is a special reason for David being up this late. A nine-year-old boy doesn’t stay up until around midnight just to stomp on a toy car, and then hint that he just did something that might give his governess reason to call the police and have him arrested.