The Blue Envelope Mystery
| MPAA Rating: | NR |
| Genre: | Drama |
| Country: | United States |
| Directed By: | Wilfrid North |
| Written By: | Helen Duey, Sophie Kerr |
| Cast: | Harry Northrup, Lillian Walker, Adolphe Menjou, William Shea, Isabel West, Charles Kent, Bob Hay, Florence Radinoff, John Drew Bennett, Josephine Earle |
| In Theaters: | Oct 23, 1916 |
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