A group of people who knew each other years before discover that members of the group are being killed off one by one by someone who calls himself (or herself) The Green Ghost. The survivors gather at an old mansion to find out who is doing the killing and why, and discover that the murderer is a member of that very group.
| Actor | Role |
|---|---|
 André LuguetLord Montague | Lord Montague |
 Jetta GoudalLady Efra | Lady Efra |
 Pauline GaronLady Violette | Lady Violette |
 Georges RenaventDr. Ballon | Dr. Ballon |
| JJules RaucourtSir James Rimsay | Sir James Rimsay |
 André BerleyNot listed | Not listed |
 Marcelle CordayLa femme de chambre | La femme de chambre |
 Youcca TroubetzkovLieutenant Savor | Lieutenant Savor |
 Lionel BelmoreCommandant Endicott | Commandant Endicott |
 Edgar BarrierLe médecin | Le médecin |
 Émile ChautardAbdoul | Abdoul |