In 1927 Hollywood, a silent film production company and cast make a difficult transition to sound.

G-men grab a gangster and a governor thanks to a clerk in the fingerprints division.

A ghost helps the Bowery Boys capture a gang of crooks led by a mad doctor.

A federal agent and his partner track uranium-ore hijackers with radar.

A stranded carnival dancer takes on a corrupt political boss when she marries into small-town society.

Conceited singer Garry Mitchell refuses to renew his radio contract, so agent Doug Blake decides to find a new personality to replace him. In New York, he finds Martha Gibson, a single mother with a great voice. He arranges for her to move to Hollywood, but then has a problem trying to sell her to the show's sponsor. Doug tries every trick he can think of to make Martha a star, and as the two work more closely, he falls in love with her. Complicating matters further, Martha meets and becomes attracted to Garry.