A scientist kills his rival with a perfect alibi and tries to get away with it.
| Actor | Role |
|---|---|
| GGiuseppe PagliariniIspettore Gates | Ispettore Gates |
| GGiuseppe CaldaniGeorge Appleby | George Appleby |
 Carlo AlighieroSergente May | Sergente May |
 Mario FerrariSignor Prescott | Signor Prescott |
| RRomolo CostaProfessor Prothers | Professor Prothers |
| LLuisa RivelliHelen Webster | Helen Webster |
| LLoris GafforioEldridge | Eldridge |