An airline flight lands at an airport in England, where the passengers are told they must be delayed and quarantined for 24 hours due to a smallpox scare. Two of them, Helen Strickland and American Army Lt. Col. Calvin Brampton, escape. A third passenger, a secret agent, also escapes but is fatally shot. Before dying, he entrusts important official documents to Brampton to be delivered to the Prime Minister. Meanwhile, Strickland is also heading to London to intercept a private letter that must not be seen by her husband.
The two team up and are pursued by the police for breaking quarantine, and by the two sinister henchmen who shot the secret agent and who work for an organization that wants the documents in order to instigate an uprising in Africa. After various adventures, Calvin and Strickland achieve their ends and say their farewells. The smallpox scare turns out to have been nothing more than a case of chicken pox.
This was the last film produced by Luckwell, and was the second of two thrillers (the other being The Runaway (1964), shot back-to-back with Delayed Flight)[3][4][5] which he and Young made at Bray Studios, owned at that time by Hammer Films.[6]
Release
The film was intended to be distributed by Columbia Pictures, but was not released in the UK or US. In Australia, it was shown to accompany other Columbia films such as Fail Safe (1964) and The Long Ships (1964).[6]
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