Different codes and ciphers, credits to where I've got those- probably from Google or people I know.

#Detective

The Sign of the Four - Plot summary. The Sign of the Four is the second of Arthur Conan Doyle's Sherlock Holmes novels. In it the detective and his companion Dr Watson unravel a mystery of hidden treasure and murder. ... Holmes takes on her case and the adventure begins.

The Adventures of Sherlock Holmes is a collection of twelve stories written by Arthur Conan Doyle featuring his famous detective.