The police arrest a man climbing over the wall of a cemetery after midnight. He claims that he is being blackmailed and is following instructions he received by mail to leave $1000 on a certain grave. It turns out that he's not the only one who got a blackmail letter from the same person--calling himself "The Black Panther"--and it also turns out that all the recipients are connected to an opera company.

Unusually elaborate for a PRC film, Minstrel Man is a lively musical drama built around the talents of veteran vaudevillian Benny Fields. The star is cast as Dixie Boy Johnson, who rises from the ranks of minstrel shows to become a top Broadway attraction. On the opening night of his greatest stage triumph, Dixie Boy's wife dies in childbirth. Profoundly shaken, he walks out of the show, leaving the baby to be raised by his showbiz pals Mae and Lasses White (Gladys George, Roscoe Karns). The kid grows up to be an attractive young woman named Caroline (Judy Clark), who follows in her dad's footsteps by billing herself as-that's right-Dixie Girl Johnson. This leads to a tearful reunion between Caroline and the father she'd long assumed to be dead. If Minstrel Man seems at times to be a dress rehearsal for Columbia's The Jolson Story (1946), it shouldn't surprising: the PRC film was directed by Joseph H. Lewis, who went on to helm Jolson Story's musical highlights.

A test pilot and his weather observer develop a "robot" control so airplanes can be flown without pilots, but enemy agents get wind of it and try to steal it or destroy it.

The gang is sent to the Wilton Reform School after they are unjustly convicted of stealing a truck. Bill Collins, brother of co-leader Danny, becomes involved in a killing and, while also innocent, is convicted and sentenced to death. Through a series of events, Muggs, Glimpy, Danny and the rest of the gang, learn that Knobby, a henchman of Luke Manning, knows something about the murder.

After Police Captain Dan McLaren becomes police commissioner, former detective Johnny Blake publicly punches him, convincing rackets boss Al Kruger that Blake is sincere in his effort to join the mob. "Bugs" Fenner, meanwhile, is certain that Blake is a police agent.