Captain Peter, called also "Black Peter" because of his dark moods, is found dead. The police inspector Hopkins tries to find the murderer but without any success. He then contacts Holmes asking him for help with the case. Holmes and Hopkins are at the crime scene where they decide to hide and see if the guilty one will show up again. And then a young man enters the room. What happened afterwards? Did they catch the murderer or there is something more to the story? Will Holmes solve the case or this one will be harder than expected?

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.