"O Tangerine" is a novel by the Portuguese writer Ash de Queiroz that reflects his deep understanding of the social and cultural problems of his time. In this work, the author successfully combined philosophical considerations with detective intrigue, or the literary genre "novel under oath". The main character - Rekagdu - receives an extraordinary inheritance, which is connected with the solution of a mysterious crime - the murder of a Portuguese merchant in China. This novel is a vivid example of realist literature of the 19th century, marked by a deep reflection on the contradictions of human destiny and society.