When excessive Sherlock Holmes fame began to bother Conan Doyle, he decided to "kill" his hero. However, the emergence of the story in which Holmes killed in a skirmish with the leader of the London underworld Professor Moriarty, caused general outrage readers and even threats against the author. We also know that in a letter from the Buckingham Palace allegedly wrote that fall into the abyss - just a clever idea detective. That the author had to resurrect his character.
The Return of Sherlock Holmes