The last of four uncredited appearances in the series by Emile Stemmler, the others being in E5, The Long Weekend (1959), E7 Diamond S.O.S. (1959) and E26 The Girl with Grey Hair (1960).
The second of two appearances in the series by Paula Byrne, the first being in E20, Game for Three Hands (1960).
The second of two appearances in the series by Caroline Leigh, the first being an uncredited role in E23, Payment in Advance (1960).
Charles Korvin only has a few scenes at the start and end of the program, most of the investigative legwork is done by Hazel Court.