In a Germany suffering the aftermath of World War I, a humble shoemaker named Wilhelm Voigt lives an almost miserable life, trapped in the frustrations of an oppressive bureaucratic system. Desperate to improve his fortunes, Voigt decides to adopt a bold plan that will transform his life and that of those around him. Using an old Prussian army captain's uniform that he stumbles upon, he becomes a cunning impostor and presents himself in the city of Köpenick.
With his new disguise, Voigt manages to convince everyone of his authority, ordering the requisition of a safe filled with money from the town hall under the pretext that he needs to fund a military mission. Chaos and confusion ensue as the citizens, filled with fear and admiration, fall under the spell of a man who, apparently, has become a symbol of power and control. However, the falseness of his act cannot last forever. As his ingenious scheme unfolds, the authorities begin to suspect, leading to a climax that challenges notions of justice, honor, and the individual's struggle against the system.
The film becomes an incisive, often comedic reflection on identity, the perception of authority, and the search for human dignity in times of adversity. Set against a backdrop rich in historical nuance, it captures the essence of an ordinary man who finds his moment of glory, albeit in an unexpected way.