Master Benedict Blackthorn is mad with his apprentice Christopher Rowe because he is late after making a fireworks and a trebuchet With his friend Tom. He lost track of time and is running to his Masters Shop. But he does not know that his Master is very Cross.
The Blackthorn key is a story about Christopher Rowe an apprentice to Master Benedict Blackthorn. But when The Cult of the Archangel is hunting down every Apothecary in town. Christopher can only hope that they don't come to his doorstep. But when they do the results are atrocious. With his Master passed away Christopher needs to use everything that he has ever learned to stop his master's killers. I would recommend this book to readers who like codes, puzzles murders and mysteries. Codes and puzzles are used throughout the book. Master Blackthorn left codes on everything from his potions to his recipes and findings. Christopher is the only person who can decipher the codes to the most dangerous potion ever. The Archangel's Fire. This Fire can make you invincible and invisible.
Christopher sees why his Master is angry. This is because there is a long line of people and they want to buy stuff like Oil of Vistaril, Mercury or Sulphur. He is surprised that so many people came while he was gone.
Master Blackthorn lies dead in his bed after his guts are sliced open. Christopher weeps in terror. His murderers had killed seven apothecary's and their apprentices. His Murderers The Cult of the Archangel has the style of killing people by slicing open their midsections and spilling their guts out.