"When you have eliminated the impossible, whatever remains, however improbable, must be the truth." — Arthur Conan Doyle An eerie letter. A missing father. A hidden treasure. And a murder that defies logic. In The Sign of the Four, the brilliant detective Sherlock Holmes is faced with one of his most puzzling and perilous cases yet. When Mary Morstan seeks his help after receiving mysterious messages for years following her father's disappearance, Holmes and Watson are pulled into a web of betrayal, colonial secrets, and a dark pact between four men. Set in the fog-shrouded streets of Victorian London and the sweltering heat of India’s past, this gripping mystery is rich in atmosphere, intrigue, and razor-sharp deduction.