"The Secret Sharer" is a mystery novel written by Joseph Conrad in 1910. The main character, a young ship captain, finds himself in a difficult situation when a mysterious man appears on board at night - white, mysterious and confident. Through a series of events, the captain risks his status and integrity to help this stranger. In this book, Conrad explores themes of identity, compassion, morality, and inner struggle. "Secret Companion" is a tangible story that leaves the reader with reflections on the true essence of human relationships and one's own self. This sophisticated work of a literary master will leave a mark in the heart of anyone who feels a passion for analyzing human nature and complex interpersonal relationships.