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A pair of murders occur within a few days of each other, but there seems to be no relation between the two deaths. At least, that's what the authorities believe until Quincy (Jack Klugman) finds a common factor: both victims were killed by the same handgun, which had been stolen from its original owner nearly five years before. Embarking upon another in a long line of crusades, Quincy endeavors to change the current firearm laws which allow unlicensed gun sales to proceed without any legal checking system. The episode's shattering climax was obviously inspired by the equally powerful finale of the classic 1974 TV movie The Gun.