For the first time, one of the most important works in the creative heritage of the famous Portuguese poet and writer Mário de Sá Carneiro (1890–1916) is being published in Russian - his only novel, “The Confession of Lúcio” (1914). The exquisite friendship of two decadent writers, while maintaining all their complex mentality, miraculously evolves into a mysterious love triangle. The complex internal composition of the work, the bizarre language and style of writing, a crime of passion, “self-inquiry” and an unusual confession create an original narrative of the “top” literature of the Modernist era.