Mark of the Plague: Blackthorn Key

In 'Mark of the Plague,' the second book in the Blackthorn Key series by Kevin Sands, the protagonist, Christopher Rowe, faces a new challenge as the Black Death sweeps through London. As an apothecary apprentice, Christopher uses his knowledge of potions and alchemy to seek a cure for the plague. Alongside his best friend Tom and a new ally, Sally, Christopher uncovers a sinister plot involving a cult and a fake plague cure that is being sold to desperate citizens. The trio must use their wits and skills to navigate through puzzles and codes to stop the villains and find a real cure. The story is filled with historical details, adventure, and mystery, as Christopher battles not only the disease but also the greed and deception that arise in the face of fear.