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- Season 4 overviewSep 11, 1975-Mar 18, 197623 episodesSeason 4 episodes1. Poisoned Snow Sep 11, 1975
- Personal tragedy leads a narcotics officer to seek retribution.
- 2. The Glass Dart Board Sep 18, 1975
- The efficiency of Stone's new superior hampers efforts to catch a psychotic killer.
- 3. No Place to Hide Sep 25, 1975
- A prison gang pressures a convict and his wife into smuggling drugs.
- 4. Men Will Die Oct 2, 1975
- A rape victim is charged with murdering one of her attackers; guests Vera Miles, Paula Kelly.
- 5. School of Fear Oct 9, 1975
- Steve becomes the unwilling "student" of a deranged teacher.
- 6. Deadly Silence Oct 16, 1975
- Injured Stone must undergo delicate surgery to restore his hearing.
- 7. Murder by Proxy Oct 23, 1975
- Stone and Keller investigate neighborhood violence and murder.
- 8. Trail of Terror Oct 30, 1975
- Killers chase Keller while he is transporting a prisoner.
- 9. Web of Lies Nov 6, 1975
- Details surrounding a diamond robbery and a police officer's death become confused.
- 10. Dead Air Nov 13, 1975
- A radio personality is charged with slaying a girl who attempted to blackmail him.
- 11. Merchants of Death Nov 20, 1975
- Rival street gangs go to war after a member is murdered; guests Greg Morris, Lonny Chapman.
- 12. The Cat's Paw Dec 4, 1975
- Stone and another police inspector (Diane Baker) clash over solving the same case.
- 13. Spooks for Sale Dec 11, 1975
- A wiretapped factory and a missing notebook are clues to a mystery; guest Tom Selleck.
- 14. Most Likely to Succeed Dec 18, 1975
- Robbery seems to be the motive for a teacher's death, until a student is nearly killed.
- 15. Police Buff Jan 8, 1976
- A man on trial for a police officer's murder is freed, then slain by a vigilante.
- 16. The Honorable Profession Jan 15, 1976
- Witness in a robbery that resulted in a police officer's death vanishes.
- 17. Requiem for a Murder Jan 22, 1976
- A bishop is fatally shot while kneeling in prayer, leaving no tangible clues for Stone to pursue.
- 18. Underground Jan 29, 1976
- A police officer signs a fake resignation and goes under cover.
- 19. Judgement Day Feb 19, 1976
- Stone and Keller intercept the murderer of five lawyers who plans to kill another.
- 20. Clown of Death Feb 26, 1976
- Stone and Keller investigate three murders among circus personnel.
- 21. Superstar Mar 4, 1976
- Stone and Keller clash with a visiting New York police officer while trying to capture a killer.
- 22. Alien Country Mar 11, 1976
- Illegal alien is wanted for murder; Stone and Keller search for real killer.
- 23. Runaway Mar 18, 1976
- Stone and a 15-year-old runaway girl search for the same man, her fugitive father.