Marshall Blair has just been promoted to Inspector, so let’s join him in his office as he tells about his first case. A murder on a train has him puzzled. It is made to look like a suicide, but the family is pressing to investigate closer. It would be a classic mystery novel crime with the murder taking place in a sealed room, with no way in or out, and alibis all around for the players. The audio gets a little broken up mid way through.
Blair scrutinizes the physical clues and evidence, and the forensics man thinks Blair is a little too old fashioned to appreciate today’s modern 1938 technology. Blair uses his old fashioned ways to fill in a gap or two that the scientific methods can’t explain. Piecing together the new evidence, that was previously overlooked, Blair figures out a motive, and a timeframe that implicates a suspect.
PS: I don’t think it’s so much a battle of old fashoned ways, and the weakness of the forensics. Whoever did the original investigation of the crime scene clearly didn’t gather all the clues, or evidence to be analyzed. It boils down to a matter of having an experienced crime scene investigator, which Blair certainly is.