მკვლელობის საიდუმლო ოცდაათი კითხვა

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

Liam Redmond Echo News editor

Homi Bode Mohammed Ali

Kynaston Reeves Gen. Maitland

Sonya O'Shea Stewart MacPherson's secretary