A mysterious secret. A brave detective. A thrilling adventure! When Helen Stoner hears the same strange whistle that her sister did before her mysterious death, she turns to Sherlock Holmes in fear for her life. At the gloomy estate of Stoke Moran, Holmes and Watson uncover a deadly secret hidden in the darkness-can they solve the mystery of the "speckled band" before it strikes again? This special edition is written for young readers learning English. It uses clear sentences, useful vocabulary, and easy-to-read typography with optimized type sizes, and precisely calibrated leading and kerning for an enjoyable reading experience. Perfect for B1-B2 learners and enjoyable for all ages.