A foreign agent in the guise of a Colonel Mannering has found an ingenious method of extracting secret information from British agents.
British agents are being tricked by a foreign spy in the guise of Colonel Mannering into believing that they are taking part in an interrogation exercise when they are actually betraying their contacts. When Steed convinces one of them that he has been duped he must locate Mannering and his latest subject - Miss King.—don @ minifie-1