Ballinger investigates after a bank robber leaves a pencil at the scene.

A sniper is terrorizing Chicago. Ballinger joins the hunt.

A boxer's (Lancaster) life is being threatened soon after another fighter dies after fighting with Lancaster. Suspicion falls on the other fighter's trainer who feels Lancaster is responsible for the death of the other fighter.

A man's aunt reports her nephew is missing. Ballinger investigates.

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Frank Ballinger and his colleagues on the M Squad have to find a needle in a haystack: a cop killer somewhere in the city of Chicago. Their only clues are an old magazine and the killer's habit of saying "You bet."

A woman dies. Ballinger investigates.

Bank robbers hide in a suburban house.

2 innocent men are iced by a currency exchange bookkeeper, to disguise her embezzlement. The sultry femme fatale's yarn that it was a heist gone bad makes sense at first, because of a wave of such robberies on Chicago's Far East Side. But the murdered customer Halper checks out as a solid working stiff, plus the other stick-ups were solo jobs while this was supposedly a 2 hood hold-up, so M Squad's debonair Lt. Ballinger's sic-ed on the case to soften up hard boiled Ora Kane.

Lt. Frank Ballinger keeps an eye on Hazel, a bar girl with a record who nonetheless wants to go straight. He discovers she is involved with Joe Mazzerin, a safecracker. Ballinger goes undercover to get the goods on Mazzerin and to learn who his mysterious partner is.

When a convicted murderer gets the upper hand on Lieutenant Ballinger during a train ride back to Chicago, his last best hope for recapturing the felon is the persistence of an alert young boy.

Ballinger investigates a murder with multiple motives.

Ballinger goes undercover to capture a robbery suspect.

A young wife is shot by an unknown assailant when she drives with her ex-con husband to an isolated woods in search of their dream home. No one even reports the couple missing until after the police find them dead in the snow. The wife's sister is a wealthy spinster, who takes her time even coming to Chicago, claiming her brother-in-law was threatened with death by a blackmailer. Det. Ballinger suspects the sister knows more than she reveals.

Lieutenant Ballinger searches for a mentally ill young woman who shot a psychiatrist, hoping all the while that he can also find sufficient evidence to obtain a felony conviction against the charlatan who was "treating" her.

A millionaire is found dead in a locked room. His young pretty wife (Fay Spain), and the big hansom driver (Ken Clark), are suspected of the crime. Lee Marvin figures out how the crime was committed.

When perennial loser Wally Gardner is identified as the perpetrator of a robbery-murder, he tells police unique details of a stranger he met miles away at the time of the crime. But when that stranger is found, he says he can prove that HE was miles from where Gardner says they met at the time of the crime. Lt. Frank Ballinger must determine who's lying.

When his partner in an investigation is killed, Lt. Frank Ballinger makes it a personal business to pin the crime on narcotics lord Sam Hinder. But, as Ballinger discovers, Hinder has an unusual reason for wanting to keep the police out of his own personal business.

Ballinger suspects an inside job when a dry cleaning company refuses to knuckle under to a shakedown mob.

Kathy Bane, an old flame of Ballinger's, needs his help when a blackmailer trying to extort money turns up dead-- in her apartment.

A woman loses her memory. Bellinger investigates.

A man confesses to a crime he may not have committed. Meanwhile the president of the company where the man works has been shot to death.

The Squad is on the lookout for a bank robbery suspect with a unique feature, witnesses say he has gold teeth.

Chicago cop Frank Ballinger stages a rescue in order to gain the confidence of Alice, a young woman who works for suspected jewelry fence Louis Prince. Pretending to be furniture salesman Bob Steele, Ballinger romances Alice and gets friendly with her boss. But Alice falls for "Bob" and Ballinger must weigh her feelings and safety against his duty as a police officer.

The room mate of the third murder victim of the Blue Indigo serial killer may be the only link Ballinger has to catching him.