|The Long Arm|
|Directed by||Charles Frend|
|Written by||Robert Barr|
|Produced by||Michael Balcon|
|Edited by||Gordon Stone|
|Music by||Gerard Schurmann|
|Distributed by||Rank Film Distributors (UK)|
The Long Arm (USA: The Third Key) is a 1956 British film noir police procedural crime film starring Jack Hawkins. The film, which was based on a screenplay by Robert Barr and Janet Green, was directed by Charles Frend and produced by Michael Balcon. It was shot on location in London and Snowdonia in North Wales.
Two years later Hawkins played a similar role in John Ford's Gideon's Day , a film based on books by John Creasey.
When police respond to a burglar alarm at premises in Long Acre, Central London, they find nothing amiss after meeting the nightwatchman, who allows them to search the premises. However, the next day the safe, which had been opened with a key, is found empty. Supt Tom Halliday (Jack Hawkins) and his new Detective Sergeant Ward (John Stratton), begin searching for the fraudulent nightwatchman.
Halliday eventually concludes that the false nightwatchman has committed 14 safe-breaking jobs across the country, all on the same type of safe, and all completed with genuine keys. Visiting the safe manufacturer, Halliday gets the names of all current and former staff, but they are all cleared. When another safe is broken into, a young man on his way to work (Ian Bannen) sees the thief climbing over the gate, and, realising something is wrong, tries to stop the thieves escaping but is deliberately run over by the getaway car. However, the victim manages to pass limited information to the police before dying. The hit-and-run vehicle is found in a scrapyard. The car has been stolen from a Mrs Elliot. Inside they find a newspaper that leads them to a garage in North Wales and to a Mr Gilson, a deceased former employee of the safe manufacturer.
Halliday finds that there are 28 more safes of the same type in London. He also finds that the thief is being tipped off by an insurance agent about which safes contain significant amounts of cash. The police arrange with the owner of a safe located in the Royal Festival Hall to let the insurance agent know about gala nights, which generate a lot of cash that will be stored in the safe overnight. They tail the insurance agent to a meeting with Mrs Elliot, the woman whose car was stolen. She is identified as Mrs Gilson, the wife of the apparently dead safe key maker.
Halliday and Ward deduce that Gilson faked his own death after spending years making duplicate keys for all the safes his company produced. Gilson breaks into the Royal Festival Hall, but the detectives are waiting. Mrs Gilson arrives and waits in her car in the nearby car park. After a short scuffle, Mr Gilson punches Ward and make a run for it, but is soon re-captured by the police. Meantime, Halliday jumps on the bonnet of Mrs Gilson's car and breaks the windscreen, preventing Mrs Gilson from seeing where she is driving. Halliday is thrown from the car bonnet and lands on the ground. Both Mr and Mrs Gilson are arrested and the case is solved.
The film premiered at Gaumont Haymarket in London on 22 June 1956.  However, the reviewer for The Times was not impressed, and found the story implausible and "not quite clever enough" even though it used a documentary filming style.  It won the Silver Bear for an Outstanding Single Achievement award at the 6th Berlin International Film Festival. 
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