The Valley of Fear is the final novel in the Sherlock Holmes series by Sir Arthur Conan Doyle . The story originally appeared over several issues of the monthly Strand Magazine in late 1914 before being published as a standalone work. While Doyle would continue to publish Sherlock Holmes short stories until 1927, The Valley of Fear remains Holmes’ final long-form appearance.

In the novel, Holmes and his assistant Watson are called to assist with an investigation into the murder of John Douglas, a man shot in his own home at point-blank range with a shotgun. As evidence is examined and witnesses within the house are questioned, Holmes uncovers holes in testimonies and a connection to a secret society that no one wishes to discuss.