Given the task definition and input, reply with output. In this task, five ordered key facts are given. All the given facts are expressed in natural language. Your job is to generate a story 100 to 1000 words long, that includes all the facts given as input in their order of appearance while expanding upon them to produce a broader, yet coherent, narrative.

Fact1: advanced British aircraft prototypes carrying experimental and secret equipment are vanishing with crews on test flights, Fact2: Kay is working undercover in works canteen, Fact3: Hammond At is seen as outsider at aircraft factory by Barrett first Major, Fact4: Barrett is working under government contract, Fact5: Jenkins give up names of contacts

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
user
In September 1938, advanced British aircraft prototypes carrying experimental and secret equipment are vanishing with their crews on test flights. No one can fathom why, not even spymaster Major Hammond Ralph Richardson or his sister Kay Valerie Hobson, a newspaper reporter, who is working undercover in the works canteen used by the crews at the Barrett  Ward Aircraft Company. At first Major Hammond is seen as an outsider at the aircraft factory, especially by Mr. Barrett, the owner George Merritt, who is working under a government contract but he soon finds a friend in a star pilot, Tony McVane Laurence Olivier who helps him try to solve the case. Hammond becomes convinced that Jenkins George Curzon, the company secretary at the factory, is a foreign agent and mole but Jenkins is killed by unseen gunmen before he can give up the names of his contacts. McVane returns to the aircraft factory, determined to make the next test flight. His aircraft, like the others, is brought down by a powerful ray beamed from the S.S. Viking, a mysterious salvage ship manned by a foreign crew. Although the nationality of the crew and agents aboard the Viking is only implied, it was understood by audiences, All of the crew speak with German accents and little doubt is left who the villains are, wrote Variety. Along with his aircraft, McVane and his flight crew are taken hostage on the ship, where he discovers many other missing airmen have suffered the same fate. Gathering up weapons, McVane leads the British survivors in an attempt to take control of the ship. Major Hammond learns the truth and directs a Royal Navy ship HMS Echo to come to their rescue. Kay and McVane form a relationship and Hammond learns, to his chagrin, that his longtime lady friend, whose plans with him are repeatedly being cancelled as the action escalates, has married someone else.