Harriet O'Malley tries to solve a murder aboard a train en route to New York.
| Actor | Role |
|---|---|
 Marjorie MainHarriet O'Malley | Harriet O'Malley |
 James WhitmoreJohn Malone | John Malone |
 Ann DvorakConnie Kepplar | Connie Kepplar |
 Phyllis KirkKay | Kay |
 Fred ClarkTim Marino | Tim Marino |
 Dorothy MaloneLola Gillway | Lola Gillway |
 Clinton SundbergDonald | Donald |
 Douglas FowleySteve Kepplar | Steve Kepplar |
 Willard WatermanMr. Ogle | Mr. Ogle |
 Don PorterMyron Brynk | Myron Brynk |
 Jack BaileyGame Show Host | Game Show Host |
 Nancy SaundersJoanie | Joanie |
| BBasil TellouThe Greek | The Greek |
 James BurkeThe Train Conductor | The Train Conductor |
 Frank CadyHarry (uncredited) | Harry (uncredited) |
 Mae ClarkeTrain Passenger (uncredited) | Train Passenger (uncredited) |
 Regis ToomeyReporter (uncredited) | Reporter (uncredited) |