A professor comes up with a system to win at roulette, and goes to the famous casino at Monte Carlo to try it out. When he turns up murdered and his "system" missing, a reporter sets out to find the killer--and the system.
| Actor | Role |
|---|---|
 Errol FlynnDyter | Dyter |
 Eve GrayGilian | Gilian |
 Paul GraetzDr. Heinrich Becker | Dr. Heinrich Becker |
 Molly LamontMargaret Becker | Margaret Becker |
| EEllis IrvingMarc Orton | Marc Orton |
 Laurence HanrayCollum | Collum |
 Henry VictorMajor | Major |