Watching this episode you get the feeling that a great opportunity was missed. The first eleven minutes take place on a limited set, the train to Geneva. To get some action the characters had to move about, go from berth to berth, wagon to wagon. As such it resembles a French farce, that theatrical tradition with people running in and out of rooms. The limited set forced the writers to create a complex plot, rather than rely on (repeated) one-liners.
Unfortunately, after eleven minutes, we go to business as usual. How I wished that they had stuck to the action on the train. I suppose they felt it difficult to include all the characters, but I'm sure that in a normal six-episode season Croft & Lloyd would have pulled it off.
