Although I usually do not like historical fiction novels, this book managed to surpass my expectations and become one of my favorites. The Blackthorn Key follows the story of Christopher Rowe, the apprentice of the renowned apothecary Benedict Blackthorn, and takes place in 17th century England. In the beginning, Christopher lives content, creating medical remedies and cracking codes with his kind master, although he sets off a couple of explosions along the way. But a string of apothecary murders begins to work its way through England and hits closer and closer to Christopher's home, with rumors of the killings being tied to the mysterious Cult of the Archangel. When the murderers eventually kill Benedict, Christopher discovers a cryptic note left by his master right before his death and finds himself hunted by the killers, and as he deciphers Benedict's last message, he uncovers the secrets to a powerful weapon that has the potential to destroy the world.
This novel is thrilling and fast paced, and although its plot is dark in nature, Sands brilliantly incorporates some laugh-out-loud humor into the book. I loved Christopher's personality; he is easygoing and playful, but also incredibly clever and serious when he needs to be. The little nods to the historical aspect of the novel were very enjoyable, especially if you do know what was happening in England during the time period this novel is set in. The plot is filled with twists and turns that keep you guessing what happens next, and the ultimate reveal of the mastermind behind the killings serves as a stunning climax to the novel. As this book is the first in a series, I will surely read the rest of the novels and keep an eye out for Sands' other works. I recommend this book to anyone interested in historical fiction, fantasy, mystery novels, and puzzles.