The Persephone Code by Julia Golding
My rating: 4 of 5 stars

Hellfire Club Caves, 1812. Here is where Anthony Pennington dies, murdered, but what secrets could he have told. Rev Leighton holds a letter from Anthony to be given to his half sister Dora. Dr Sandys takes on the mission to retrieve Dora. But that is only the start of their adventures with the Hellfire Club and the Illuminati.
An enjoyable historical mystery

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