A historical photograph shows a room in a steel and glass building and a man which is evidently the architect Mies van der Rohe. Only the name of the photographer is known. In a manner more usually found in detective novels, the author has painstakingly researched the events surrounding its taking making deductions and gradually revealing in which room the architect is standing, in which building it is to be found, what the architect is looking at, what his stance and his gaze tell us about his person, his work. Step by step, the author systematically investigates the photograph, drawing fascinating conclusions and making astonishing revelations about the architecture, the man and his character from this one photograph. His hypothesis is illustrated by a short and compelling text and supported by further visual material.