The Blackthorn Key (Blackthorn Key Series #1)

Following a series of murders, an apothecary's apprentice must solve puzzles and decipher codes in pursuit of a secret that could destroy the world in this “spectacular debut” (Kirkus Reviews, starred review).

“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 th...