Engineers will like the resolution of this locked room mystery. Dr. John Evelyn Thorndyke, a former medical doctor who became a forensic investigator of crimes, has to deal with murder behind locked doors. The only clue he has is an aluminum dagger shoved into the back of the victim.
One of the unique aspects of detective stories by R. Austin Freeman is that Freeman personally tested the methods described in his stories. The top floor of his house was a workshop and laboratory where he could try out and investigate sometimes arcane scientific knowledge from areas such as tropical medicine, metallurgy, and toxicology.
1st edition 1910, PDF 23 pages.
word count: 8923 which is equivalent to 35 standard pages of text