Paul Beaumont (Lon Chaney) is a scientist who labored for years alone to prove his radical theories on the origin of mankind. Baron Regnard (Marc McDermott) becomes his patron, enabling him to do research while living in his mansion. One day, Beaumont announces to his beloved wife Marie and the Baron that he has proved all his theories and is ready to present them before the Academy of the Sciences. He leaves the arrangements to the Baron. However, after Beaumont goes to sleep, Marie steals his key, opens the safe containing his papers, and gives them to the baron.