
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.

as Bob Beacham

as Mary Game

as Tom Harmon

as Det. Insp. Charlton

as Olive Tavy

as Self - The Twenty Questions Team

as Self - The Twenty Questions Team guest artiste

as Self - The Twenty Questions Team

as Self - The Twenty Questions Team

as Self - The Twenty Questions Team 'Mystery Voice'

as Self - The Twenty Questions Team

as Maurice Emery KC

as Echo News editor

as Mohammed Ali

as Gen. Maitland

as Stewart MacPherson's secretary

as Police Commissioner

as Police Officer 'Tiny' White

as John Grimshaw

as Record News editor

as Cheshire Cheese waiter

as Doctor

as Mrs. Tavy's Neighbour (uncredited)

as Frederick 'Ricky' Tavey (uncredited)