Plainsclothes policeman Jay Madigan is found knifed on the docks near the carnival. Pete undercovers that the shooting gallery at the carnival is smuggling something in the dolls, heroin.
Inventor Janos Kolanski goes to Pete for help. Apparently there is a faction after his plans for his newest invention: a deadly rifle.
Willie Coronado is found dead in the dryer of a laundromat. He was one of the men involved in a daring bank robbery involving one million dollars. Louis hires Pete to find out who killed his partner and to cut a deal with the DA's office for his involvement.
Cliffie, the blind newspaper vendor is afraid of Brenners, who was convicted and escaped after his sentence has been given. He hires Pete to protect him from Al Brenners and his sidekick Stringer.
Gunn is "sentenced" to death for the murder of a clerk, but he escapes jail.
Actor Frankie Burns is murdered on the set of a new movie. Gunn finds out that the crime was committed to cover up an old crime.
Arnie Kelton, musician and ex-convict, asks Gunn to investigate his wife's death.
A little man with homemade bombs has been blowing up four or five gangsters at a clip. Now the mob bosses have hired Gunn to find the culprit.
Paul Conlon, a school teacher, is grading papers at school when he hears a scream. He goes to investigate and finds a dead girl, is arrested for her murder, and hires Gunn to prove his innocence.
A secretary has important papers that incriminate her boss and becomes frightened when attempts are made on her life. The real story is that Lyles, a bank robber, offs two of his cohorts after looking for the key to the safe deposit book where the loot is.
Eric gets himself a trench coat and a pretty secretary. Now he's ready to start his career as he bumbles his way around town and interferes with the police departmen.t Eric is called in by Janos Thorwald to bring in his easy mark of a son.