A police detective uses fluorescent powder to catch a pickpocket and her gang.

A young Irishwoman comes to the United States to live and work with her mother as a cleaning lady at Carnegie Hall. She becomes attached to the place as the people she meets there gradually shape her life. The film also includes a variety of performances from some of the foremost musical artists of the times: conductors Bruno Walter & Leopold Stokowski, solists Arthur Rubinstein & Jascha Haifetz, singers Lily Pons & Jan Peerce and bandleader Vaughn Monroe among many others.

Smith is an iron-willed railroad detective. When his friend Murray is fired from the railroad and begins helping Rebstock wreck trains, Smith must go after him. He also seems to have an interest in Murray's wife (and vice versa).

A small-town newspaper editor defies threats to expose the mob.