One of the best book written by authot canan doyle. This book contains the story of sherlock holmes(fictional character). In this book sherlock holmes solves innumerous cases of mystery. With his intelligence he solves the mysteries which the police cannot solve. The story is associated in london. And all the cases are solved in london.
He also solves the cases if terrorist attacks and many others. Dr. Watson and Iren Adler are also the best chracters of all time.