Conversation so far:
When did Charles Baudelaire die ?
Charles Baudelaire died on 31 August 1867
Where is Charles Baudelaire buried ?
Charles Baudelaire is buried in the Cimetière du Montparnasse, Paris
Did Charles Baudelaire write any poems or books in his final years ?
Charles Baudelaire worked on a translation and adaptation of Thomas De Quincey's Confessions of an English Opium Eater. Other works in the years that followed included Petits Poèmes en prose

Question: Can you name one of those books published posthumously ?
Self-contained rewrite: Can you name one of those books by charles baudelaire  published posthumously ?