Lucy Holmes and Henry Watson are looking for clues that can help them solve the mystery of the blue stone. Through reading this intriguing story and many captivating challenges, children aged 8 to 10 will be able to improve their comprehension skills of the written text… and help the two protagonists solve the riddle!

Lucy Holmes and Henry Watson are the protagonists of the series of workbooks Text Comprehension… in crime designed to help primary school children improve their ability to understand written text. Since they are direct descendants of the famous Sherlock Holmes and his assistant, Dr. John H. Watson, the series offers some of Sir Arthur Conan Doyle’s most famous stories, revisited and enriched with many captivating challenges.