A masked criminal who dresses like a giant bat terrorizes the guests at an old house rented by a mystery writer.
| Actor | Role |
|---|---|
 George BerangerGideon Bell | Gideon Bell |
 Charles HerzingerCourleigh Fleming | Courleigh Fleming |
 Emily FitzroyCornelia Van Gorder | Cornelia Van Gorder |
 Louise FazendaLizzie Allen | Lizzie Allen |
 Arthur HousmanRichard Fleming | Richard Fleming |
 Robert McKimDr. Wells | Dr. Wells |
 Jack PickfordBrooks Bailey | Brooks Bailey |
 Jewel CarmenDale Ogden | Dale Ogden |
 Sôjin KamiyamaBilly the Butler | Billy the Butler |
 Eddie GribbonDetective Anderson | Detective Anderson |
 Tullio CarminatiDetective Moletti | Detective Moletti |
 Lee ShumwayThe Unknown | The Unknown |