Each episode is introduced by Orson Welles, the only regular actor in the series, whose appearances were confined to the introductory and closing sequences.

[2] In the opening titles, Welles appears shown in silhouette walking through a hallway towards the camera, smoking a cigar and outfitted in a broad-brimmed hat and a huge cloak.

On the day of her last concert before her departure, a member of the country's secret police visits her, and recruits her against her will to spy on the hotel room next door, which serves as a drop-off point for rebel messages.

In the 19th century, Charles Stubbs is a perfectly ordinary citizen, until one day, he sees a terrifying spirit of a murdered old man appear to him.

Later, when Stubbs reads in the papers about Higgins' execution, the ghost appears to him a final time, nodding thanks, then fading away, having been put to rest.