"Four Days" is a novel by the French writer Emile Zola, which tells about the mysterious disappearance of a young woman during four days. In this book, the author explores the themes of loyalty, betrayal, family relationships and society. Zola recreates the life of French society of the 19th century with its nuances, contradictions and deep feelings of the characters. Readers who are interested in psychological novels and subtle relationships between characters will eagerly be confused by trying to solve the mystery of "Four Days".