A maniacal murderer at large in foggy London provides the setting. Theodore Bikel as a harried police sergeant, and Rhys Williams as an over zealous newspaperman, co-star in this episode about a rash of murders by strangulation. Although the police sergeant alerts his men after the first murders, that of an ordinary little man and his wife, he is frustrated time after time in his attempt to capture the murderer. The seasonal, heavy fog is no help and soon both the flower lady on the corner and one of his own policemen are included among the victims. To make matters worse, the newspaperman needles him about his ineptness and even appears at the scene of the crime before the policemen.