Clue of the Silver Key

Bernard Lee

as Superintendent Meredith

Lyndon Brook

as Gerry Domford

Finlay Currie

as Harvey Lane

Jennifer Daniel

as Mary Lane

Patrick Cargill

as Binny

Anthony Sharp

as Mike Hennessey

Sam Kydd

as Horace Tickler

Eve Eden

as Secretary

Derrick Sherwin

as Quigley

Stanley Morgan

as Sgt. Anson