The skull of the Damascus Man, commonly called 'The Missing Link' is stolen from the Danier Museum. A man and a woman are fleeing from the museum and the guard, who doesn't see the woman, takes a shot at the man. I was surprised that the guard actually had a gun and moreover actually fired at the man. Later, Sir Henry Danier, owner of the museum and discoverer of the Damascus Man (a discovery that earned Danier his knighthood) identifies the young man as a chemist, Tom Grafton. The woman who got away is Evelyn Inness, Danier's research assistant who he had just fired. The couple claim that the skull had already been stolen by someone else and further, Innes claims that the skull was a fake and that she tried to tell Danier this and that's why he fired her. The museum's curator provides March with some background information on the expedition that led to the discovery of the skull and that one of the members of the expedition had died before the discovery was made. While a solid enough episode, there is nothing particularly special or interesting about it except for the scene where Ames and March are trapped in a locked room with poison gas flowing into it. Nonetheless, a fairly pedestrian outing.