The Mystery of No. 47 (1917)
Genres: Comedy, Silent, Thriller
Cast: Ralph C. Herz, Casson Ferguson
The Mystery of No. 47 is a 1917 American silent comedy thriller film directed by Otis B. Thayer and starring Ralph C. Herz, Nellie Hartley and Casson Ferguson. It is an adaptation of the 1912 novel of the same title by British writer J. Storer Clouston.