The Five Orange Pips

John Openshaw lives with his uncle Elias, who used to live on a plantation in the States. Strange things have been happening of late in their home. There’s a door that is always locked and his uncle’s behaviour has become erratic. One day, a letter arrives from India with only the mention "K. K. K." on it. It contained five orange pips.
"The Five Orange Pips" is part of "The Adventures of Sherlock Holmes".
Sir Arthur Conan Doyle (1859-1930) was born in Scotland and studied medicine at the University of Edinburgh. After his studies, he worked as a ship’s surgeon on various boats. During the Second Boer War, he was an army doctor in South Africa. When he came back to the United Kingdom, he opened his own practice and started writing crime books. He is best known for his thrilling stories about the adventures of Sherlock Holmes. He published four novels and more than 50 short-stories starring the detective and Dr Watson, and they play an important role in the history of crime fiction. Other than the Sherlock Holmes series, Doyle wrote around thirty more books, in genres such as science-fiction, fantasy, historical novels, but also poetry, plays, and non-fiction.