- Country: UK
- Genres: Crime, Drama, Mystery
- Release: 1956-06-01
- Director: Charles Frend
- Writers: Robert Barr , Janet Green , Dorothy Christie , Campbell Christie
- Language: English
- Stars: Jack Hawkins , John Stratton , Dorothy Alison , Michael Brooke , Sam Kydd , Glyn Houston , Richard Leech , Richard Leech , Newton Blick , Geoffrey Keen , Sydney Tafler
- Runtime: 96 min
- Awards: Nominated for 1 BAFTA Award1 win & 1 nomination total
- AKA: Lovens lange arm (Norway) , The Long Arm (Singapore) , S.O.S. Scotland Yard (France, French Republic) , La lunga mano (Italy) , The Long Arm (United Kingdom) , O Segredo e a Chave (Portugal, Portuguese Republic) , The Long Arm , The Third Key (Canada) , Der lange Arm , Pitkä käsi (Finland) , Falske nøgler (Denmark) , A hosszú kéz (Hungary) , To makry heri (Greece) , Scotland Yard - Schrecken der Unterwelt (Austria) , Justiça Final (Brazil) , Длинная рука , Üçüncü anahtar (Turkey) , The Long Arm (Australia) , Den långa armen (Sweden) , 더 롱 암 (Korea) , The Third Key (United States of America) , Politie zonder wapen (Netherlands the) , Treci kljuc , S.O.S. Scotland Yard (Belgium)
- Plot: Someone has broken into the safe of a London company, and yet no force or explosive was used, and the keys do not appear to have been lost. A police superintendent is investigating, assisted by a new and very keen sergeant. The superintendent's wife is worried that he may be in personal danger, and the superintendent is not always mindful of the need to reassure his wife. Then a safe in another business is also robbed without the use of force, but the robber's getaway car runs down a bystander, who later dies. There seems to be nothing to link the crimes, but then the getaway car is found abandoned in a scrap yard. A discarded newspaper in the car may be a crucial lead in solving the crime, but there isn't much to go on.
- IMDB:tt0049845
The Third Key Cast · · · ALL
Charles Frend
Director
Jack Hawkins
Supt Tom Halliday
John Stratton
Sergeant Ward
Dorothy Alison
Mary Halliday
Michael Brooke
Tony Halliday
Sam Kydd
Police Constable in Information Room
Glyn Houston
Detective Sergeant in 'Q' car
Richard Leech
Nightwatchman / Gilson
Newton Blick
Deputy Commander
Geoffrey Keen
Chief Superintendent Jim Malcolm
Sydney Tafler
Stone
Peter Burton
Creasey
George Rose
Slob
Arthur Rigby
Detective Inspector at Chester
Ralph Truman
Colonel Blenkinsop
Ian Bannen
The Young Workman - Stanley James
Maureen Davis
The Young Workman's Wife - Mrs. James
John Warwick
Detective Inspector at Shipping Office
Joss Ambler
Cashier at Shipping Office
Barry Keegan
Detective Constable in Hospital Ward
Alec McCowen
House Surgeon
Harry Locke
Secondhand Dealer
Nicholas Parsons
Police Constable Bates
Ursula Howells
Mrs. Elliot / Mrs. Gilson
David Davies
Welsh Police Constable
Meredith Edwards
Mr. Thomas