The Blackthorn Key Series by Kevin Sands

Middle Grade - Ages 10-14

“Tell no one what I’ve given you.”

Until he got that cryptic warning, Christopher Rowe was happy, learning how to solve complex codes and puzzles and creating powerful medicines, potions, and weapons as an apprentice to Master Benedict Blackthorn—with maybe an explosion or two along the way.

But when a mysterious cult begins to prey on London’s apothecaries, the trail of murders grows closer and closer to Blackthorn’s shop. With time running out, Christopher must use every skill he’s learned to discover the key to a terrible secret with the power to tear the world apart.

Soon, Christopher is embroiled in high-stakes games that lead him and his friends on heart-stopping adventures rich with suspense, mystery, and unforgettable characters.