A lawyer receives a note telling him that he'll be dead in 48 hours - and Scotland Yard must work fast to uncover the serial killer known as 'The Ringer'.
Patrick Barr
as Det. Insp. Alan Wembury
Alexander Knox
as Dr Anthony Lomond
Wilfrid Lawson
as Maurice Meister
Sonnie Hale
as Samuel Cuthbert 'Sam' Hackett
Louise Henry
as Cora Ann Milton
John Longden
as Inspector Bliss
Patricia Roc
as Mary Lenley
Peter Croft
as John Lenley
Arthur Hambling
as Det. Sgt. Richards
George Merritt
as Police Station Sergeant
John Turnbull
as Prison Governor
Charles Eaton
as Col. Walford
