Opened in November 1916. Closed August 20, 1917 after 350 performances — 10 months. The Thirteenth Chair is a 1916 play by the American writer Bayard Veiller. It has three acts and a single setting. The action takes place entirely in the drawing room of a large house in New York City during one evening. One critic labelled it a melodrama using mystery fiction devices: a murder during a seance, and a locked-room mystery. There are no clues given to the audience to identify the murderer, who is exposed only by supernatural agency in the last act. Wiki link