Inspector Killany of the New York City police department is called in to investigate the murder of a subway passenger and the usual-and-unusual suspects climb on and off at each stop.
| Actor | Role |
|---|---|
 Jack HoltInspector Killian | Inspector Killian |
 Aileen PringleDale Tracy | Dale Tracy |
 Fred KelseyDetective Kearney | Detective Kearney |
 Alan RoscoeEdward Tracy | Edward Tracy |
 Jason Robards Sr.Paul Bordon | Paul Bordon |
 Sidney BraceyHerman Stevens | Herman Stevens |
 Selmer JacksonMason | Mason |
 William HumphreyMr. Cotton | Mr. Cotton |
 Ethel WalesMrs. Cotton | Mrs. Cotton |
 Max AsherMr. Blotnick | Mr. Blotnick |
| BBertha BlackmanMrs. Blotnick | Mrs. Blotnick |
 Lillian LeightonMrs. Mary Mullins (as Julianne Leighton) | Mrs. Mary Mullins (as Julianne Leighton) |
| JJames GossMulvaney | Mulvaney |
| MMason WilliamsPrizefighter | Prizefighter |
| BBert LindenSheck | Sheck |
| RRobert St. AngeloZippe | Zippe |
 John KellyMotorman | Motorman |
| DDorothy BayMiss Smith | Miss Smith |
 Bob KortmanGuard | Guard |
| SSally St. ClairFlapper | Flapper |
 Mary GordonMrs. Delaney | Mrs. Delaney |
| EEarl SeidSydney | Sydney |
| GGinger ConnollyThomas | Thomas |