The Valley of fear – en inglés

“The Valley of Fear is the fourth and final Sherlock Holmes novel by Sir Arthur Conan Doyle. The story starts with Sherlock Holmes receiving a ciphered message from an agent of Professor Moriarty but without the key to the cipher. The novel is divided into two parts: in the first, Holmes investigates an apparent murder and discovers that the body belongs to another man; and in the second, the story of the man originally thought to have been the victim is told.”

Arthur Ignatius Conan Doyle