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

The squad hunts down a cop killer.

The squad goes after a jail inmate who's just escaped.

Lt. Frank Ballinger investigates the case of a gambling ring and its connection to an unidentified police officer. The deeper into the investigation he gets, the more Ballinger becomes concerned that the crooked cop may be an old friend.

A jewelry store robbery sends the thief to prison, but his claim that the night watchman, a former big-league ballplayer named Lightnin' Joe Adams, was in on the heist costs Adams his job. Lt. Frank Ballinger goes undercover in prison to find out from the robber whether Adams was involved in the crime and what happened to the loot.

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."

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.