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Originally released in England as Counterspy, Undercover Agent stars Dermot Walsh in the title role. When the film begins, however, Manning (Walsh) isn't a spy, but a mild-mannered accountant. Asked by a mysterious stranger to deliver a package, ostensibly containing compromising love letters, Manning arrives at the appointed address, only to stumble across the body of a murdered man. Upon discovering that the package contains the secret plans for a revolutionary new jet, Manning is forced to take it on the lam, lest he be the next victim. Future "scream queen" Hazel Court is the film's nominal (and inconsequential) leading lady.