The four episodes on the first disc are from the mid-Sixties, about a small-time private eye called Marker, and they get better (not many survived). Well worth watching. Avaiable for renting are only this two-disc set and those from 1975, when it was coming to an end.
The third of these epsodes is particularly good, about an apparently missing husband. Small casts, fifty-minutes' running time and mostly interiors. All well done, unpredictable.
The second disc contains only one episode - about an exhibition of paintings in a public library which is linked with a blackmail case. Another ingenious episode. The disc also includes on an-location interview with Marks at the time, and it is a surprise to find that his own voice is very different from the one he brings to the character Marker.