In a pre-arranged set-up, a cop strikes his police-chief, is fired and infiltrates the mob but when the police-chief is murdered, the ex-cop is unable to prove his innocence and is left-out in the cold, on the wrong side of the law.

A gambler comes into town to testify before the grand jury. He is killed by the mob before he can testify. Joe Geary (Kennedy) is fired from the police force for being soft on crime. This is a setup between him and the Police Chief so that Geary can infiltrate the gangsters. Geary then goes to prison when the police chief is killed. Geary escapes from prison and with the governor's help proves he is innocent and cleans up the mob.—<[email protected]>

Gambler King Carney returns to his hometown to testify at a grand jury hearing on illegal gambling purportedly run by the Laughlin syndicate. Carney is gunned down dead before he can testify. The identity of the shooter is unknown, but eyewitnesses identify the driver of the shooter's getaway car as Louie Butler, a known criminal. Butler is located and held in prison, where he is later found dead, hung by his own belt. The police do not believe it was suicide because of the nature of the death, which to many means an inside police job as no one else but the police would have had access. Who Police Chief Sprague openly muses is that inside man is Sergeant Joe Geary. While Geary was once his best friend on the force, Sprague believes something bad has happened to him the past few weeks. A public altercation between Sprague and Geary leads to Geary's dismissal from the force. In reality, this event was staged between the two friends so that Geary could go undercover into the illegal gambling world to discover the head of the Laughlin syndicate and the identity of the murderer. No one else, not even Alice Devlin, Geary's girl and soon to be fiancée, knows of Sprague and Geary's plan. That plan soon goes off the rails which places Geary's life in danger. Within restricted conditions, Geary has to locate another criminal named Benny McKaye who has gone into hiding, and/or prove to someone else in authority of who the murderer is to get himself out of his predicament. Geary will need the help of those he knows he can trust, which includes no one on the police force, the police who would rather see him dead - especially "the inside man" - and who have a shoot to kill on sight policy regarding him.—Huggo