A female agent tracks down the cause of mysterious explosions.
| Actor | Role |
|---|---|
 Karen MorleyLinda Beech | Linda Beech |
 Robert BaldwinDerrick Holt | Derrick Holt |
 Eduardo CiannelliFranz Jorg | Franz Jorg |
 Katharine AlexanderHelen Lavering | Helen Lavering |
 Claude KingEric Ledyard | Eric Ledyard |
 Agnes AndersonMary Smith | Mary Smith |
 MillyMilli Monti | Milli Monti |
 Jon HallBertie | Bertie |
 Ted AdamsMontritz Hotel Valet | Montritz Hotel Valet |
 Leonid KinskeyMischa | Mischa |
 Dennis O'KeefeJohn | John |
 Odette MyrtilYvonne Dupre | Yvonne Dupre |
 Don BrodieJoe | Joe |
 Gino CorradoViolinist / Translator | Violinist / Translator |
| FFred FarrellPorter | Porter |
 Alphonse MartellValet #2 | Valet #2 |
 Philip SleemanValet #1 | Valet #1 |