Magnum, P.I. (1980)

Higgins sustains a concussion hours before the guests are to arrive for a charity gala at the estate, and begins to lapse in and out of believing he is famed Shakespearean actor Sir Fearing Pangborn; Thomas enlists Rick and T.C. to cover security for the event while he takes up the slack left by Higgins's injury, and has his hands full when all the guests, dressed as famous characters of the 1920s in keeping with the gala's ""Great Gatsby"" theme, begin to arrive hours ahead of the appointed time; a crime wave breaks out when someone dressed in the same Charlie Chaplin costume as Rick is seen fleeing from a guest's room moments before thousands of dollars in cash and jewelry are reported missing and an addled Higgins is the prime suspect in the murder of one of the guests; as he begins to realize that people and events are not what they seem, Thomas takes his inspiration from the six-hour First Annual KHKU Agatha Christie Film Festival he viewed the previous night to solve the crimes a