At the death of Count de Beaulieu, his daughter Jeanne learns that her father had been the arch-criminal known as The Phantom. The only other person who knew her father's identity was his lieutenant, Franz Leroux, who now demands that Jeanne marry him in return for his silence.
Unfortunately the movie The Phantom's Secret is not yet available on HBO Max.
| Directing | Charles Swickard | Director |
| Writing | J. Grubb Alexander | Writer |
