"Double Four" is a tense detective novel by the famous English writer E. Phillips Oppenheim. The main character faces an unusual situation when it turns out that the mysterious "Double Four Club" is ready to commit a crime that threatens not only him personally, but the whole world. The reader, together with the hero of the book, will experience incredible adventures, unravel mysteries and cross paths with formidable opponents. To delve into the intrigues of this mysterious story means to feel all the color and atmosphere of the mysterious world created by an outstanding master of words.