The story 'The Midnight Visitor' effectively challenges the conventional image of a secret agent and strongly emphasizes the theme that 'appearances can be deceptive'. Fowler, expecting a dashing, adventurous spy, is disappointed by Ausable's fat physique, American accent, and ordinary apartment. However, Ausable's true genius lies not in his looks or physical prowess, but in his sharp intellect and quick-wittedness. Max, on the other hand, fits the conventional image of a menacing spy with his pistol, yet he proves to be gullible and easily outsmarted. The key events further underscore this theme: the 'balcony' appears to be a real escape route for Max, leading to his downfall, and the 'police' who knock are merely a waiter. Ultimately, Ausable's success, despite his unglamorous exterior, teaches Fowler, and the reader, that true effectiveness and intelligence in the world of espionage reside in the mind rather than in a captivating appearance.