R. Austin Freeman
These are two short stories from the collection THE GREAT PORTRAIT MYSTERY: "PERCIVAL BLAND'S PROXY" and "THE MISSING MORTGAGEE", wherein the brilliant medical investigator, Dr. Thorndyke, solves murderous crimes.
Percival Bland was an uncommon criminal. He knew that his continual passing of counterfeit banknotes would eventually catch up with him, so he had a plan--precautions against the inevitable catastrophe. We can understand
...When Andrew Drayton, a collector of jewelry, is found stabbed to death and the young woman who tried to stop the murderer is wounded, Dr Thorndyke is called in to investigate. But although the scene of the crime seems awash with the fingerprints of the attacker, there may be good reason why the police can't trace the killer. But not only are the facts of the case proving to be vexing but the discovery of a secret chamber and its sinister contents
...This is the tantalizing tale of a missing world-renowned archaeologist that, so far, no one seems to be able to find any clues to. Dr. Thorndyke, our detective, is unusually perceptive and begins to find clues leading to a man with a tattoo of the "Eye of Osiris".
12) The Singing Bone
15) A Silent Witness
Mr Polton Explains / R. Austin Freeman
"Told through the eyes of a watchmaker, Dr Thorndyke is once again faced with a nettly mystery involving a mysterious fire in a Soho house filled with supposedly inflammable objects. What transpires is an entertaining and amazing twist thanks to the eagle eyes of the Doctor and his friend the watchmaker, Mr Polton." (Goodreads)