The Sign of Four

A parent might reach for this book when they notice their teenager is ready for more complex intellectual challenges or is showing an interest in logic, deduction, and historical mysteries. It is a perfect fit for the child who enjoys deconstructing problems and appreciates a protagonist who values intellect over brute force. This classic novel follows Sherlock Holmes and Dr. Watson as they unravel a decades-old mystery involving stolen treasure, a secret pact, and a mysterious murder in Victorian London. While the plot is a gripping adventure, the book also explores themes of loyalty, the consequences of greed, and the deep friendship between the lead characters. Because it was written in 1890, it provides a rich vocabulary-building experience and a window into historical British culture, though it requires some discussion regarding the colonial-era perspectives common to the time period. It is best suited for readers aged 11 and up who have the patience for descriptive prose and the maturity to handle 19th-century social contexts.