In Dangerous Freight, Sammy Marsden was the chief pilot of General Air Transportation, a private air freight company based at Gatwick which carried, among other things, fruit and vegetables from Africa. In the story, Biggles reads about Marsden dying in an aircrash in the Camargue. At that time, Marsden had been carrying a load of gold in his Douglas DC-3. Sammy Marsden had commanded a bomber squadron during the Second World War. The DC-3 was a reliable an sturdy aircraft. The Camargue was well-known for being flat and featureless. Biggles just could not believe that a pilot of Marsden's experience could fail to put an aircraft down safely on the Camargue no matter what trouble he had encountered and so decided to investigate the circumstances of his death.