The Blackthorn Key

Penguin presents the unabridged, downloadable, audiobook edition of The Blackthorn Key by Kevin Sands, read by Ray Panthaki.
Follow the clues. Crack the code. Stay alive.
Potions, puzzles and the occasional explosion are all in a day's work for young apothecary Christopher Rowe. Murder is another matter.
It's a dangerous time to be the apprentice of Benedict Blackthorn. A wave of mysterious murders has sent shockwaves through London, and soon Christopher finds himself on the run. His only allies are his best friend, Tom, courageous Molly, and a loyal feathered friend, Bridget. His only clues are a coded message about his master's most dangerous project, and a cryptic warning - 'Tell no one!'
The race is on for Christopher: crack the code and uncover its secret, or become the next victim . . .
A brilliant, fast-paced adventure perfect for fans of Percy Jackson.