Product DescriptionSince her father disappeared, she has received a large pearl through the post on the same day, every year, for six years. Who is sending them? And what about her father's paper with the words 'The Sign of Four' written on it? Sherlock Holmes alone can solve these mysteries.About the AuthorSir Arthur Conan Doyle (1859-1930) was a Scottish writer who studied medicine before becoming the writer of the famous Sherlock Holmes series.