In The Case of the Man on a Spot, Ludwig Steffans was a Polish defector who found himself "on a spot" after his wife got abducted by Communist agents. Ludwig was a former Free Polish Air Force pilot who served in Britain during the Second World War and as a result, spoke English well. In the early 1950s, 5 years before the events narrated in the story, Ludwig came to Britain, sought and was granted political asylum. To secure his position, he informed the Polish government that he held certain incriminating documents which would be made public should any harm come to him.
Ludwig took up a job as a farm worker and settled down in a cottage in the village of Hollesey on the Suffolk coast. All went well for a while until he married a local Suffolk girl named Helen, who worked in the canteen of a local U.S. Army maintenance depot.
While out on a shopping trip to the village, Helen was abducted by Communist agents and taken to Warsaw. The agents then offered to return Helen if Ludwig would return certain incriminating documents in his possession.
As it was believed that an aircraft was used in the abduction, Biggles was asked to investigate. When Biggles called on Ludwig, he found him in a state of near panic. Ludwig did not believe that any good would come of returning the documents as that would merely result in him being killed and Helen would not be returned in any case. He told Biggles the Communist agents would be returning that very night to get his final answer. Ludwig had borrowed a twelve-bore shotgun from his employer and was preparing to shoot the agents.
Biggles managed to calm Ludwig down and convinced him to leave the matter in official hands. When a Communist agent arrived, Biggles took a tough line with the agents, threatening to make the papers public unless Helen was returned within twenty four hours. Obviously Biggles' threat was convincing enough. The next night Helen was brought back by a light aircraft. Biggles returned the documents but then told the two Communist agents and the pilot that he had made photocopies of the doucments--if the Steffans were harassed again, he would make them public.
Dismissing the visitors, Biggles then told the pilot to go back to London with his colleagues as he had asked Bertie to burn his aircraft. The men left the cottage but a short while later, there was the sound of a loud commotion outside. Later, Biggles and co. found the aftermath of a scuffle--a car had be thrown upside down into a pond and a flattened hat and broken spectacles were on the ground nearby. It seemed some American servicemen, encouraged by Biggles, had decided to "express their opinion" about the abduction of Helen, who was popular in their canteen.