 A Nazi scientist is sprung from a German prison, with Solo and Kuryakin in pursuit. While the scientist escapes, one of the plotters is killed. Kuryakin impersonates the man and travels to South America. Solo goes to the continent separately, but cannot shake a woman photographer who had been on the scene when the scientist escaped. It turns out Thrush is financing the plot, which involves a mind-control ray, which is to be used on Washington just as the president is scheduled to speak before Congress.