The Red Thumb Mark by R. Austin Freeman
My rating: 4 of 5 stars

Dr Thorndyke latest client is a Reuben Hornby. Diamonds that were kept in his Uncle's safe have been stolen.. The keys were kept by his Uncle John Hornby. But a bloody finger print left in the safe points to Reuben Hornby. Who proclaims his innocence. Thorndyke is helped by old friend Dr Jervis.
An interesting historical mystery.
Originally published in 1907

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