... and that is not surprising since this was one of the Quincy movies at 75 minutes made to fit in a 90 minute time-slot and pared down to 48 minutes to fit into a 60 minute time-slot for TV syndication. I feel like some key plot points might have been extracted in that 27 minutes that were discarded.
The episode has Quincy teaching a college course on forensic pathology to some medical students. One of the students finds a leg bone at a construction site and brings the bone to class. Quincy notices that the bone has a bullet wound and thus wonders where the rest of the body is and how the person died, assuming it was foul play. The class goes to the site, but cannot find the rest of the body. Thus Quincy takes that one bone and determines through forensic science a lot about the physical appearance of the human it once belonged to.
There are lots of conclusions drawn in this episode, especially when the investigation segues from what the person looked like to WHO the person actually was. Some of the clues leading to the conclusions made do not appear to be in the episode with the emphasis being more on the dramatic moments as far as what got retained in the syndication version. The DVD set of the series has the complete movies rather than the syndicated versions of these episodes in case you are that curious.
As an aside, at the construction site where the bone was found, Monohan and Dr. Astin show up to chide Quincy for getting in way of the construction project there. Monohan is in his customary gray suit, but Dr. Astin shows up dressed like the white Shaft! I realize that 70s clothes look like something that is worn on a dare, but Astin's outfit is loud even by those standards.