The calm prevailing on Baker Street is interrupted by the visit of Mary Morstan. A beautiful, young woman seeks help from Sherlock Holmes. It turns out that for the past 10 years, on the anniversary of her father's mysterious disappearance, someone sends her a precious pearl. This time, however, she also received a letter, in which there is a proposal for a meeting. Undertaking the unraveling of this mystery, the characters do not anticipate how difficult and dangerous this adventure will be. Soon, the titular sign of four will appear, and in a closed room from the inside, they will find the body of a man killed in a rather unusual way. They will embark on a frantic pursuit of the criminals, all in order to discover the truth and recover the treasure. From now on, every detail, every minute counts...
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Sir Arthur Conan Doyle (1859–1930) was born of Irish parentage in Scotland. He studied medicine at the University of Edinburgh, but he also had a passion for storytelling. His first book introduced that prototype of the modern detective in fiction, Sherlock Holmes. Despite the immense popularity Holmes gained throughout the world, Doyle was not overly fond of the character and preferred to write other stories. Eventually popular demand won out and he continued to satisfy readers with the adventures of the legendary sleuth. He also wrote historical romances and made two essays into pseudoscientific fantasy: The Lost World and The Poison Belt.