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 danger threatens London, Christopher must use every skill he's learned to discover the key to a terrible secret with the power to tear the world apart. Packed with heart-stopping action, mysterious conspiracies, and secret codes, this award-winning series is an adventure you'll never forget.

This paperback boxed set includes:
The Blackthorn Key
Mark of the Plague
The Assassin's Curse
The Call of the Wraith