The Sixteenth Rail

This is an Apple Books audiobook narrated by a digital voice based on a human narrator.
Before there was CSI and NCIS, there was a mild-mannered forensic scientist whose diligence would help solve the 20th century's greatest crime. Arthur Koehler was called the "Sherlock Holmes of his era" for his work tracing the ladder used to kidnap Charles Lindbergh's son to Bruno Hauptmann's attic and garage. A gripping tale of science and true crime.