Blackstone and the Burning Secret by Sally Spencer
My rating: 4 of 5 stars

May 1900 and a fire in Tooley Street is soon put out by the fire service. Bt a letter is discovered on the fire engine, addressed to Inspector Blackstone demanding money or else the next one will be worse. But by following the discovered clues leads Blackstone to an unwelcome conclusion.
An enjoyable complicated well-written mystery

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