Quincy is giving forensic testimony in a court case when he runs into his old professor and mentor, Dr. Herbert Stone (Barry Sullivan).
It turns out Stone is testifying for opposing counsel as an expert witness and says that he disputes Quincy's findings. Quincy is so flustered by his old mentor saying that Quincy was wrong that he is rendered speechless - worth the price of admission in and of itself.
Later, there is a terrible fire at a business. It is believed that the man killed in the fire is William Farrell, because of his thick glasses. But Quincy thinks this might not be the victim since some new forensic methods show that the body is that of a much younger man. Farrell's widow hires a lawyer to sue the city to force them to release the death certificate so that she can collect her life insurance, and again, the forensic expert witness opposing Quincy is his old mentor who again thinks Quincy is wrong. Quincy is confused - how can there be two truths? This leads Quincy to discover some unpleasant facts about his old friend.
This was a pretty good episode talking about society's throwaway attitude toward the elderly and how some professions are valued over others monetarily without being preachy or overly sentimental, which was a problem Quincy had in later seasons. Plus this was a very good subdued role for Barry Sullivan, if you've seen him in his earlier days playing tough characters.