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.

Jack Holt
as Inspector Killian

Aileen Pringle
as Dale Tracy

Fred Kelsey
as Detective Kearney

Alan Roscoe
as Edward Tracy

Jason Robards Sr.
as Paul Bordon

Sidney Bracey
as Herman Stevens

Selmer Jackson
as Mason

William Humphrey
as Mr. Cotton

Ethel Wales
as Mrs. Cotton

Max Asher
as Mr. Blotnick