The Wrong Man

Hitchcock's favorite plot device was the innocent person accused of a crime they did not commit. This scenario terrified him personally, and he transmitted that terror to audiences by making them share the protagonist's helpless panic. North by Northwest, The 39 Steps, and Strangers on a Train all build their tension from this single premise.

The "wrong man" device works because every viewer secretly fears it. False accusation strips away identity and control — the two things humans need most. Hitchcock understood that vulnerability creates identification more effectively than heroism.