The Devil's Grin by Annelie Wendeberg
My rating: 4 of 5 stars

Dr. Anton Kronberg is a bacteriologist who is called in by the police to the scene of a body - a cholera victim - who has been found floating in the city's drinking water supply. There he meets Sherlock Holmes who in the space of a few minutes has discovered the Doctor's secret. They then join forces to solve the crime of the cholera victims

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