TV journalist Tab Holland assists Scotland yard with the murder of a reclusive millionaire whose corpse is discovered locked in a vault. The key to the vault is mysteriously found on the table beside the corpse.

Paul Daneman
as Rex Lander

Bernard Archard
as Superintendent Carver

James Villiers
as Tab Holland

Katherine Woodville
as Jane Ardfern

Clive Morton
as Ramsey Brown

Wolfe Morris
as Yeh Ling

David Horne
as John Trasmere

Julie Shearing
as Waitress

Leslie Sands
as Sergeant Harris

Ruth Kettlewell
as Mrs. Rushby