Mark of the Plague

Reach for this book when your middle-schooler is ready for a high-stakes adventure that demands logic and critical thinking in the face of fear. This sequel finds young apothecary Christopher Rowe navigating a London ravaged by the Black Death of 1665, where he must use his knowledge of chemistry and codes to hunt for a mysterious cure while evading those who would kill for it. It is a sophisticated historical thriller that explores how scientific curiosity and loyalty provide an anchor during times of societal crisis. While the setting is grim, the story emphasizes resilience and the power of friendship. It is ideal for readers aged 10 to 14 who enjoy complex puzzles and are not afraid of some darker, realistic historical tension.