An ex-con bears a grudge against the city of Los Angeles. He wants to blow up city hall unless his demands are met. He has a powerful bomb. The police find 28 sticks of dynamite in his apartment. Only Sergeant Friday has the power to stop this 1950s terrorist attack.
Friday begins to question Henry Ross, a suspect in a man's disappearance, which Friday believes is actually a murder. Ross coolly and calmly denies any involvement in the disappearance, but Friday's relentless interrogation soon begin to crack the man's facade.
Friday and Jacobs question a jeweler regarding the robbery of a colleague. The man takes offense at being questioned about the incident, but as the detectives begin to amass evidence, the jeweler's outrage quickly begins to lose credibility.
Friday and Jacobs are called to the apartment of a man who phoned in the fatal shooting of his wife. He claims it was suicide, but upon looking at the crime scene and talking to neighbors they begin to wonder if it was murder.