Detective Ballinger is brought in to investigate the murder of night club owner Joe Dalio. The case seems open and cut with a suspect in custody, however Ballinger has just enough doubt to continue the investigation.

Lanny Cord escapes from a court room and disappears. Ballinger is interested in the case because he's originally arrested Cord and had always sworn to kill Ballinger if he had the opportunity.

A bookkeeper is robbed and murdered at a circus. A clown named Laslo is identified as the killer. Ballinger and the rest of M squad have to deal with how Laslo could have committed the crime while performing in front of 5000 people in the main tent.

A witness fingers the gangster who cut a rival in half with a shotgun blast, but the killer's alibied by a beautiful actress. The thesp is beloved in ChiTown and has a sterling rep that'll guarantee acquittal. Lt. Ballinger must discredit her story and find out why Tammy's lying for smarmy hood Sandy, who now controls the Loop liquor racket.

Danny Sutton is arrested. During the interview a rookie detective makes a mistake and Sutton gets access to a gun and Ballinger finds himself caught in a tense hostage situation.

Ballinger and M squad are called in to investigate a diamond robbery. All the evidence points to an inside job. M squad have the tough task of working out who was the inside connection.

A trio of bank robbers try to blow a safe. It all goes wrong and one of the criminals is killed in the explosion. Ballinger thinks there is a connection between other bank vault jobs in the area.

After a narcotics robbery, Ballinger makes an arrest, but is concerned the collar was too easy. Everything about the arrested person does not seem to add up and Ballinger pushes hard for answers.

Mrs Ashton is killed during a house robbery. The M squad are brought in to try and work out what happened. A very open and shut case suddenly becomes exceedingly complex.

Detective Ballinger is called in after what seems to be a professional hit on a desk clerk at a hotel. A witness identifies who may have done the killing, but Ballinger is concerned he can not find any connection for why the clerk should have been shot.

A woman and her baby are hospitalized after a group of bank robbers run them down during an escape. Ballinger wants the men for the robbery but more importantly he wants them to pay for what happened to the woman and her baby

When an "electronic brain" worth $2,000,000 is stolen and held for ransom of $300,000, Captain Grey and Lieutenant Ballinger devise an elaborate ruse that they hope will lead them to the computer and the thieves.

A badly beaten man is admitted to hospital. He does not have long to live and the police need to work fast to solve the mystery. The man appears unremarkable other than being an identical twin of Ballinger.

A plane is blown up killing ten people. Evidence begins to indicate that it wasn't an accident. Ballinger begins to follow the trail and starts to discover a complicated insurance scam in action.

Ballinger gets a tip from John Clavell, that an old drug dealer Manny Franchette is coming back into town to re-establish his old network. Clavell wants no part of it having decided to got straight.

Herbie Ryder gains fame for stopping a bank robbery. After a media interview he is shot and killed. Ballinger is brought in in the belief that organized crime has ordered the hit.

Lieutenant Ballinger works to solve a series of armed holdups as a means toward the capture of shotgun-wielding Ma Phelan, who murdered a detective while helping her son Pete escape from police custody.

A man is killed while sleeping Ballinger begins to investigate and discovers very different opinions about the dead man's character exist.

Harry Conklin is killed while on the way to a secret Senate hearing into stand over tactics in the trucking industry. Suspicion falls heavily on a rival Martin Bodie. It is up to Ballinger to fight through the silence and uncover the truth.

An armored car is hijacked during a pickup at a government installation. There are surprisingly fews clues left behind by the criminals and Ballinger needs to try and unravel the mystery.

Accompanied by a female reporter, Lieutenant Ballinger investigates an elderly woman's charge that the man who robbed her store and killed a police officer was able to escape as a direct result of Officer George Maxwell's cowardice.

Sonny Bradley is charged with murder. Ballinger begins to investigate and quickly realizes something is not right about the statements from the witnesses, and starts see a much bigger game being played.

Used car salesman Larry Colman has argument with Art Brunswick, a man who claims to the be the father of Colman's daughter. Colman unearths evidence Brunswick is not who he claims to be leading to a deadly altercation.

Ballinger is brought in when a robbery and murder occurs at an armory. He is puzzled by the list of weapons stolen including a bazooka and other heavy weapons. He knows they cant sell the weapons, so what is their plan?

Ballinger is on a case involving threats against a visiting prince to Chicago. Mo one is taking the situation too seriously until a little girl accidentally finds the detonating device for a home made bomb.