The story evolves around a radio panel game show "Twenty Questions." The panel is challenged with an anonymous question. The answer leads to a series of murders in which the killer uses the programme to name his victims in advance. Two reporters spot a link between them and enlist the aid of the panel in trapping the guilty party.
Robert Beatty
Bob Beacham
Rona Anderson
Mary Game
Clifford Evans
Tom Harmon
Edward Lexy
Det. Insp. Charlton
Olga Lindo
Olive Tavy
Daphne Padel
Self - The Twenty Questions Team
Jeanne De Casalis
Self - The Twenty Questions Team guest artiste
Jack Train
Self - The Twenty Questions Team
Stewart MacPherson
Self - The Twenty Questions Team
Norman Hackforth
Self - The Twenty Questions Team 'Mystery Voice'
Richard Dimbleby
Self - The Twenty Questions Team
Harold Scott
Maurice Emery KC
