After receiving a cryptic letter, Sherlock Holmes sets off to warn a wealthy American ex-pat that he is in danger, only to find John Douglas already murdered. Investigating, Holmes uncovers the dead mana€s past as a Pinkerton agent a€“ and the hand of the arch-criminal Moriarty. Это и многое другое вы найдете в книге Sherlock Holmes. The Valley of Fear (Arthur Conan Doyle)