In The Case of the Secret Inquisitors, Adamson was a British government official who directed radio propaganda. At the time of the story, he had disappeared for a while and was later found wandering on the streets of Edinburgh. He was, according to Major Charles, "completely out of his mind". Doctor Kahn, the malevolent scientist who had organised his kidnapping later told Biggles that he had developed techniques which could empty an individual's mind as had happened to Adamson.

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