Alcoholic newspaperman Steve Bramley boards the San Capador for a restful cruise, hoping to quit drinking and begin writing a book. Also on board are Steve's friend Schulte, a private detective hoping to nab criminal Danny Checkett with a fortune in stolen bonds. Steve begins drinking, all the while observing the various stories of other passengers on board, several of whom turn out not to be who they seem to be.
| Actor | Role |
|---|---|
 Victor McLaglenJunius P. Schulte | Junius P. Schulte |
 Wynne GibsonMrs. Jeddock | Mrs. Jeddock |
 Alison SkipworthMrs. Yolanda Magruder | Mrs. Yolanda Magruder |
 John GilbertSteve Bramley | Steve Bramley |
 Helen VinsonJanet Grayson | Janet Grayson |
 Fred KeatingDanny Checkett | Danny Checkett |
 Leon ErrolLayton | Layton |
 Walter ConnollyCaptain Helquist | Captain Helquist |
 Tala BirellGerta Klangi | Gerta Klangi |
 Walter CatlettJoe Silvers | Joe Silvers |
 John WrayMr. Jeddock | Mr. Jeddock |
 Claude GillingwaterJudge Griswold | Judge Griswold |
 Emily FitzroyMrs. Victoria Griswold | Mrs. Victoria Griswold |
 Donald MeekJosephus Bushmills | Josephus Bushmills |
 Luis AlberniJuan Gilboa | Juan Gilboa |
 Akim TamiroffGeneral Salazaro | General Salazaro |
 Arthur TreacherMajor Warringforth | Major Warringforth |
 Inez CourtneyFlo | Flo |
 Curly HowardDrummer | Drummer |
 Moe HowardSaxophonist & Violinist | Saxophonist & Violinist |
 Larry FinePianist | Pianist |
 G. Pat CollinsDonlin | Donlin |
 Robert AllenUndetermined Secondary Role (uncredited) | Undetermined Secondary Role (uncredited) |
| EEthel BryantNot listed | Not listed |